The 26-year-old’s contract runs out in the summer, so barring an injury crisis and an unlikely recall he has played the last game of a disappointing spell at St James’ Park.
The Hammers stand-in boss Trevor Brooking told the club’s official website: "Wayne has now been extended and that should go for the rest of the season.
"We had to make some decision on Wayne because his loan finished at the weekend.
"Newcastle didn't want to extend it any further so it was a case of whether we took him for the season or sent him back, and if we had done that we would have had to have got someone else in.
“The fact is, we think he has done fine; we have to work on that defensive side, he knows that, but he is improving on that I think as each game goes by.
”If Wayne impresses there is the option, as he will be a free agent this summer, of signing him 'permanently'.
"He has a good incentive now because he is in the last year of his contract with Newcastle, so it is up to him to show his worth in the weeks ahead.
"I think again it is an opportunity to judge him over a longer period and at least Alan (Pardew) can then see him during training and in matches. That is why we would have liked the initial extension because naturally Alan hadn't seen him at first hand.
"But in the seven games we have won five that he has been involved in.
"In attacking areas he is contributing because he has got good delivery with his left foot - and he has just got to keep that level of performance up now.”
Didn’t take Trev too long to suss out Quinn’s strengths and weaknesses then!
Quinn has been at St James’ Park since January 2001, initially playing four Premiership games on loan before making the move permanent in an £800,000 deal.
He went on to play another 11 Premiership games and nine assorted cup matches, with his only goal coming in the 4-0 InterToto Cup win in Lokeren in July 2001.