A number of Championship clubs, including Birmingham, Barnsley and Brighton, are also believed to have been interested in the frontman.
Barnett was a youth player with West Brom before dropping into non-league with Rushall Olympic, Telford, Willenhall Town and Hednesford. He broke into the Football League with Macclesfield in the summer of 2010.
After 13 goals in 50 starts and one sub appearance in his only season with the Silkmen, the 6ft 3in tall frontman moved on to Crawley for £150,000 the following summer.
Impressive displays for the Red Devils attracted plenty of interest with the likes of Fulham, Wigan and Stoke all reported to be keeping an eye before Christmas. Blackpool agreed a fee approaching £1 million before the deal broke down.
Barnett subsequently joined Posh, initially on loan, for a similar fee in February, signing a deal until 2015. He scored in the Blues' 3-2 victory over Peterborough at Portman Road last season as he netted 19 goals over the campaign, 15 of them for Crawley. This year he has scored just once in nine starts and one substitute appearance.
The striker, club captain Gaby Zakuani, Emile Sinclair and Nathaniel Mendez-Laing were all transfer-listed and fined last week after an incident outside a nightclub in Peterborough city centre in the early hours of last Sunday morning. Zakuani and Sinclair have subsequently been taken off the list and have had their fines rescinded.
The move for Barnett is unlikely to be a signal that QPR are planning to recall DJ Campbell with the Loftus Road club unlikely to get permission to draft an additional player into their 25-man Premier League squad despite Andy Johnson and Bobby Zamora suffering injuries.
Football League clubs are entitled to bring players in on loan until Thursday with manager Mick McCarthy indicating on Saturday that he might enter the market before the deadline.
Meanwhile, Arsenal midfielder Emmanuel Frimpong has joined Charlton on loan for a month. Last week McCarthy dismissed claims that the Blues had made a move for the 20-year-old, who briefly played for him at Wolves.
Big striker. New target man? Good age, highly rated, loads of clubs were interested in him. As much as I like Murphy, he's not the best finisher. This lads scoring record is decent. Can only be a good thing I think! COYB!
Can anyone work out what is going on at Peterborough as they seem to want to drop down a league?? Can we have Boyd too please?? It also shows how far we have sunk as a club but gobbling up problem players!
Taricco - Trust me , there will be no discipline areas with Big Mick - you slip you are out .. How it should be
Good signing - I presume he can play Sat ( he was transfer listed) imagine he would be up for it !!! Him and Matt Tubbs were prolific at Crawley although Tubbs struggled since - Good work - good timing as well going out clubbing - Any defenders go out with him we could have ?
Just read this statement copied from a Posh fan on another site..... seen a few other similar comments from other Posh fans.
"They were all out in local bar getting drunk and fighting, 2 of them spent night in cells,wouldn't suprise me if one of those arrested was Barnett for impersonating a footballer he is the laziest player i have ever seen play posh be lucky to get anything for him, there was actually 5 players out the 5th player has not been named ,they shame our club with there attitude on and off pitch, well done posh chairman for not messing about with these so called players."
HA HA , I like a funny story,when i saw headline i thought we had got a barnet for Big Mick after he had pulled his hair out Saturday .However, its a striker ,and he could be a handy player.It must be bloody hard for Mick to know where to start ,defenders or strikers, both areas seriously inadequate.
mawwam I'm pretty shocked by that fan's comments. When he was playing last season he was always getting himself involved in the game. Far from lazy ...but then again I remember Gary Roberts was high energy on loan then became lazy after he got signed permanently :-