diff --git a/frontend/src/features/tickets/SprintManager.tsx b/frontend/src/features/tickets/SprintManager.tsx
index 8de7c84..dd64e73 100644
--- a/frontend/src/features/tickets/SprintManager.tsx
+++ b/frontend/src/features/tickets/SprintManager.tsx
@@ -13,22 +13,18 @@
 
 import { useState } from "react";
 
-import { Button, Input, cn } from "@/shared";
+import { Button, Input } from "@/shared";
 import { TicketRef } from "./ticketMeta";
+import { TicketPicker } from "./TicketPicker";
 import type { TicketsViewModel } from "./useTickets";
 
-const selectClass = cn(
-  "h-8 rounded-md bg-raised px-2 text-xs text-content",
-  "border border-border outline-none transition-colors",
-  "focus:border-primary disabled:cursor-not-allowed disabled:opacity-50",
-);
-
 export interface SprintManagerProps {
+  projectId: string;
   vm: TicketsViewModel;
   onClose: () => void;
 }
 
-export function SprintManager({ vm, onClose }: SprintManagerProps) {
+export function SprintManager({ projectId, vm, onClose }: SprintManagerProps) {
   const items = vm.list?.items ?? [];
   const sprints = [...vm.sprints].sort((a, b) => a.order - b.order);
 
@@ -39,6 +35,11 @@ export function SprintManager({ vm, onClose }: SprintManagerProps) {
   const [confirmDelete, setConfirmDelete] = useState<
     { id: string; name: string } | null
   >(null);
+  // The sprint whose "add ticket" TicketPicker is open, or null (#19). Held as
+  // {id,name} so the picker keeps rendering while the underlying list refreshes.
+  const [pickerSprint, setPickerSprint] = useState<
+    { id: string; name: string } | null
+  >(null);
 
   async function handleCreate(e: React.FormEvent) {
     e.preventDefault();
@@ -208,28 +209,23 @@ export function SprintManager({ vm, onClose }: SprintManagerProps) {
                       </ul>
                     )}
 
-                    {/* Add an existing ticket (backlog or another sprint). */}
-                    <select
-                      aria-label={`add ticket to sprint ${sprint.name}`}
-                      className={cn(selectClass, "mt-1 max-w-xs")}
-                      value=""
-                      disabled={vm.busy || addable.length === 0}
-                      onChange={(e) => {
-                        const ref = e.target.value;
-                        if (ref) void vm.assignSprint(ref, sprint.id);
-                      }}
-                    >
-                      <option value="">
+                    {/* Add an existing ticket via the TicketPicker popup (#19):
+                        single-select, excluding tickets already in this sprint. */}
+                    <div className="mt-1">
+                      <Button
+                        size="sm"
+                        variant="ghost"
+                        aria-label={`add ticket to sprint ${sprint.name}`}
+                        disabled={vm.busy || addable.length === 0}
+                        onClick={() =>
+                          setPickerSprint({ id: sprint.id, name: sprint.name })
+                        }
+                      >
                         {addable.length === 0
                           ? "No tickets to add"
-                          : "Add a ticket…"}
-                      </option>
-                      {addable.map((t) => (
-                        <option key={t.ref} value={t.ref}>
-                          {t.ref} {t.title}
-                        </option>
-                      ))}
-                    </select>
+                          : "Ajouter un ticket"}
+                      </Button>
+                    </div>
                   </div>
                 </li>
               );
@@ -281,6 +277,29 @@ export function SprintManager({ vm, onClose }: SprintManagerProps) {
           </div>
         </div>
       )}
+
+      {/* ── Add-ticket picker (#19) — mounts at floatingWindowNested (60), above
+          this sprint dialog. Excludes tickets already in the target sprint. ── */}
+      <TicketPicker
+        open={pickerSprint !== null}
+        projectId={projectId}
+        title={
+          pickerSprint
+            ? `Ajouter un ticket au sprint « ${pickerSprint.name} »`
+            : "Ajouter un ticket"
+        }
+        selectionMode="single"
+        excludeRefs={items
+          .filter((t) => t.sprintId === pickerSprint?.id)
+          .map((t) => t.ref)}
+        onSelect={(result) => {
+          const picked = Array.isArray(result) ? result[0] : result;
+          if (picked && pickerSprint) {
+            void vm.assignSprint(picked.ref, pickerSprint.id);
+          }
+        }}
+        onClose={() => setPickerSprint(null)}
+      />
     </div>
   );
 }
diff --git a/frontend/src/features/tickets/TicketsPanel.tsx b/frontend/src/features/tickets/TicketsPanel.tsx
index cd95fec..65b0d19 100644
--- a/frontend/src/features/tickets/TicketsPanel.tsx
+++ b/frontend/src/features/tickets/TicketsPanel.tsx
@@ -241,7 +241,11 @@ export function TicketsPanel({ projectId, onOpen }: TicketsPanelProps) {
       )}
 
       {showSprints && (
-        <SprintManager vm={vm} onClose={() => setShowSprints(false)} />
+        <SprintManager
+          projectId={projectId}
+          vm={vm}
+          onClose={() => setShowSprints(false)}
+        />
       )}
     </Panel>
   );
diff --git a/frontend/src/features/tickets/tickets.test.tsx b/frontend/src/features/tickets/tickets.test.tsx
index ae5ef44..10880ff 100644
--- a/frontend/src/features/tickets/tickets.test.tsx
+++ b/frontend/src/features/tickets/tickets.test.tsx
@@ -805,23 +805,46 @@ describe("SprintManager (#11)", () => {
     expect(fresh.title).toBe("Kept");
   });
 
-  it("adds a backlog ticket to a sprint via the add selector", async () => {
+  it("adds a backlog ticket to a sprint via the TicketPicker popup (#19)", async () => {
     ticket._seedSprint(PROJECT_ID, { id: "s1", order: 1, name: "Target" });
     const t = await ticket.create(PROJECT_ID, { title: "Backlog item" });
 
     const dialog = await openManager();
 
-    fireEvent.change(
+    // Open the add-ticket picker for the Target sprint.
+    fireEvent.click(
       await within(dialog).findByLabelText("add ticket to sprint Target"),
-      { target: { value: t.ref } },
     );
 
+    // The picker popup lists the backlog ticket — select it.
+    fireEvent.click(await screen.findByLabelText(`select ticket ${t.ref}`));
+
     await waitFor(async () => {
       const fresh = await ticket.read(PROJECT_ID, t.ref);
       expect(fresh.sprintId).toBe("s1");
     });
   });
 
+  it("excludes tickets already in the sprint from the add picker (#19)", async () => {
+    ticket._seedSprint(PROJECT_ID, { id: "s1", order: 1, name: "Target" });
+    const member = await ticket.create(PROJECT_ID, { title: "Already in" });
+    await ticket.setTicketSprint(PROJECT_ID, member.ref, "s1", member.version);
+    const backlog = await ticket.create(PROJECT_ID, { title: "Still backlog" });
+
+    const dialog = await openManager();
+    fireEvent.click(
+      await within(dialog).findByLabelText("add ticket to sprint Target"),
+    );
+
+    // The backlog ticket is offered; the one already in the sprint is excluded.
+    expect(
+      await screen.findByLabelText(`select ticket ${backlog.ref}`),
+    ).toBeTruthy();
+    expect(
+      screen.queryByLabelText(`select ticket ${member.ref}`),
+    ).toBeNull();
+  });
+
   it("removes a ticket from a sprint", async () => {
     ticket._seedSprint(PROJECT_ID, { id: "s1", order: 1, name: "Holder" });
     const t = await ticket.create(PROJECT_ID, { title: "Member" });