Holders Celtic saw off Dundee 4-0 at Dens Park in the quarter-finals of the Betfred Cup on Wednesday night.
Scott Sinclair broke the deadlock with a 25th-minute penalty and James Forrest added the second goal just before half-time.
Callum McGregor grabbed the third with a couple of minutes left and Forrest struck in stoppage time to seal an emphatic win for Brendan Rodgers' side.
