Sunderland have offered £4 million for Charlton Athletic midfielder Andy Reid.
If Keane's move proves successful, it would be his fifth capture of the January transfer window.
Loan signing Jonny Evans, French youngster Jean-Yves Mvoto, Manchester United full-back Phil Bardsley and Sweden striker Rade Prica - who scored on his debut against Birmingham last night - have all moved to Wearside this month.