“I don’t know if there is a buy-back clause and what that figure might be even if it exists,” Allardyce said.
“But my real big worry is that Manchester United will come back to buy him. Look at what happened when Chris Smalling played a handful of games for Fulham – United jumped in with £10 million.
“Then there was Phil Jones when I was at Blackburn – that’s what you are up against.”
Morrison, is currently on a £12,000 per week deal at West Ham, but, to scare off any potential bids from rivals, The Hammers are preparing to improve his salary to £60,000 per week, as his current contract expires in 18 months time.
When joining West Ham last year, The Hammers had to pay £25,000 to United whenever Morrison makes a first team appearance, but, there is a release clause in Morrison’s contract which amounts to more than £20million – a figure that West Ham are planning on renegotiating.
Morrison joined West Ham in January 2012 for £3million, but only made one appearance that season, which was against Leeds United as a 81st minute substitute. West Ham gained promotion to the Premier League through the play-offs that season, beating Blackpool 2-1 in the final at Wembley.