Antonio Conte fielded an unfamiliar XI that showed eight changes from the midweek Carabao Cup loss to Chelsea, and Spurs went behind to Anthony O'Connor's close-range finish.

Spurs boss Conte, who has reached the final in his only two previous seasons in the competition, turned to Harry Kane and Lucas Moura with a little over 20 minutes remaining. 

Tottenham levelled soon after through Harry Winks' fortuitous free-kick and Lucas completed the comeback in the 85th minute, before Kane netted to seal a nervy passage through.

Matt Doherty, one of three Spurs players to retain his place in the side along with Ben Davies and Japhet Tanganga, headed against the post from an acute angle in a lively start.

But Tottenham found themselves behind after 33 minutes when visiting captain O'Connor volleyed Alfie McCalmont's inswinging corner past Pierluigi Gollini from six yards.

Spurs were booed off at the break but Conte held off from introducing Kane for the hosts, who went close through a flicked Dele Alli shot that Trevor Carson superbly tipped over.

Ryan Sessegnon then dragged wide from a good position, after Alli's penalty appeals were waved away, prompting Conte to bring on Kane, Lucas and Oliver Skipp.

That sparked some life into the home side, with Carson misjudging Winks' free-kick from close to the left touchline as Spurs levelled.

Lucas put Tottenham in front for the first time when the Brazilian caught Ryan McLaughlin in possession, raced clear and rounded Carson for a simple finish into an empty net.

Kane, who missed a great headed chance prior to Lucas' crucial goal, added a third for Spurs with a smart finish away from the despairing Morecambe goalkeeper's reach.