Fletcher has just six months left on his current deal at Old Trafford and is rumoured to be ready to??quit United after a 19-year spell, with a host of clubs chasing the midfielder.
Spanish side Valencia and West Brom have been strongly linked with the Scotland international, who has made just one start in United colours this season in the 2-0 FA Cup win at Yeovil earlier this month.
The 30-year-old, who has made 342 appearances for United, has failed to establish himself as regular??since Louis van Gaal took over at Old Trafford.
“We’ve had no permission to speak to Darren Fletcher,” Allardyce said.??”He’s got quite a few clubs interested in him so when he makes his mind up??everyone will know.
“I don’t know what the timeline is. If any of the other packages offered to??him are accepted then we would accept that.
“Or if they hadn’t made their mind up or were negotiating somewhere else that??would be it. We can’t wait forever.
“I always think at this stage of the window, if you do get something nailed on??you have to take it because you might end up with nothing if you don’t.”
West Brom boss Tony Pulis has already confirmed his interest in bringing Fletcher to The Hawthorns.
He said: “Darren is talking to three or four clubs and he will make his decision when??it’s right to make his decision.
“We’ve shown an interest, other clubs have shown an interest and he has got to sit down and make??that decision so we will have to wait and see.”