Alan Curbishley, speaking to The Times said this about the deal:
"We did the medical and everything else 10 days ago, and it's not too late for Saturday.
"He played yesterday and Monday for Newcastle reserves. He has been training and playing games - and we will see how he is.
"We are delighted to get the player in. If you look at his history over the last couple of years he missed a lot of games with his hamstring - but once he got it sorted, he played 33 games and scored eight goals.
"He also played for England against Spain, Brazil and Andorra - so he is a current England international, and we are delighted to have him on board."
Dyer famously refused to play out wide when Bobby Robson was Newcastle manager but the player reassured fans on whufc.com that he will play wherever his manager asks him to.
"I think the gaffer sees me as quite a versatile player who can play through the centre whether that be off the strikers or as a central-midfielder that is obviously up to him but if I am required to step in to cover for any of the wide players that would be okay because I am comfortable on the left or the right and I happy at full-back as well."