Sheffield United boss Chris Wilder has threatened to continue the growing annoyance between the Blades and Watford striker Jerome Sinclair, suggesting the 20-year-old should 'man up' after he turned down a move to Brammall Lane on Transfer Deadline Day.

Watford and United had agreed a loan deal to take Sinclair to the North East on Thursday only for it to fall through in the final hours of the transfer window, and a behind-the-scenes video from Bleacher Report, starring Wilder, laid the blame firmly at the feet of the striker's agent Aidy Ward.

Ward is already infamous for his handling of Raheem Sterling's transfer from Liverpool to Manchester City last year, and supposedly left his Watford client waiting at Sheffield train station late into the final day of the transfer window after doubling the agent fee he was demanding from the Blades for the loan to be completed.

Sinclair yesterday called the video "one-sided" and "misleading", and now Wilder has responded to defend his comments - and issued a thinly-veiled suggestion that the former Liverpool forward should "man up".

He told the Sheffield Star: “The biggest situation is that players have go to take more control of their own careers in my opinion. It is their career.

“I’ve always thought that football, playing football, is the biggest driver. I’m not alone, I spoke to Harry Redknapp at Birmingham City about it, in a general sense.

"We talked about players taking ownership, manning-up, showing some [expletive] and making decisions for their own career.”