The Reds were beaten 1-0 by Manchester United in the Premier League last time out.
The 33-year-old is the Black Cats' top goalscorer this season.
Karl Henry has played a key role under all three of Queens Park Rangers's managers during the campaign to date.
Joe Bennett has joined Sheffield Wednesday on loan from Aston Villa until the end of the season.
He really couldn't resist having a pop at Spurs could he?
The 25-year-old joined the Premier League side last January.
Wolves have completed the signing of Welsh striker Aaron Colins.
The striker recently completed a move from Queens Park Rangers.
Could British boxing see yet another grudge fight in June?
Allen has struggled to regular game time for the Reds recently, but has found his scoring touch on his last two outings.