Leeds United have signed Sunderland striker Connor Wickham on loan until the end of the season.
Vito Mannone marked his return to the Emirates by watching four goals go past him as Sunderland lost 4-1 to the Italian keeper's former club Arsenal.
Emanuele Giaccherini has said that he is "happy" at Sunderland and does not plan on leaving at the end of the season.
Craig Gardner scored a wonderful goal that proved to be the match winner as Sunderland beat Southampton 1-0 in the FA Cup.
Sunderland's January arrival Santiago Vergini could gain his first league start against Manchester City.
Former Manchester United defender Wes Brown saw his third red card of the season in the fourth minute and his teammates couldn't make up for his absence losing 2-0 to visiting Hull City.
Adam Johnson continued his deadly scoring form, notching his seventh goal of the season and sixth in the past four matches, as Sunderland manhandled Newcastle United in the always heated Tyne-Wear Derby.
Sunderland winger David Moberg-Karlsson has completed a loan move to Kilmarnock for the rest of the season.
French defender Modibo Diakite has been sent on loan from Sunderland to Serie A side Fiorentina for the remainder of the season.
Nottingham Forest have re-signed Sunderland midfielder David Vaughan on loan until the end of the season.
Sunderland youngster Duncan Watmore has completed a loan move to Scottish side Hibernian until the end of the season.
Brighton midfielder Liam Bridcutt has become Sunderland’s fifth signing of the January transfer window.
Sunderland midfielder Alfred N'Diaye has joined Real Betis on loan for the rest of the season.
Sunderland have signed striker Ignacio Scocco on a two-and-a-half-year contract for an undisclosed fee.
Sunderland moved out of the Premier League bottom three for the first time since August with a 1-0 win over 10-man Stoke.