Newcastle United striker Papiss Cisse and Manchester United defender Jonny Evans could face an FA probe after an alleged 'spitting incident' during last night's Premier League clash at St James' Park.
Neither John Carver or Louis Van Gaal saw the incident during the game but both managers gave their reaction afterwards.
Manchester United won the game 1-0 with an 89th minute goal from Ashley Young.
Newcastle United boss John Carver is excited at the prospect of going head-to-head with Manchester United manager Louis Van Gaal in tomorrow night's Premier League clash.
The Dutchman has vast managerial experience with clubs including Ajax, Barcelona, Bayern Munich and the Netherlands national team.
Carver, who was placed in charge of Newcastle for the remainder of the season, is looking forward to facing Van Gaal in the St James' Park dugout.
Speaking ahead of the match, he said:
Sunderland boss Gus Poyet has defended Manchester United's recent performances, saying they 'are not as bad as people think'.
Louis Van Gaal's side came under criticism after last weekend's 2-1 defeat to Swansea. But speaking ahead of Sunderland's trip to Old Trafford on Saturday, Poyet backed Man United to recover from their recent dip in form.
Sunderland won 1-0 at Old Trafford at the end of last season as the Black Cats avoided relegation from the Premier League. But Poyet expects a different encounter this time around. He added:
Manchester United manager Louis Van Gaal refused to comment on reports that the club are close to completing the signing of Argentina winger Angel Di Maria from Real Madrid.
Manchester United manager David Moyes was pleased after his side's 4-0 win over Newcastle United on Saturday.
The Scot also provided some insight into Wayne Rooney's toe injury ahead of Wednesday's Champions League clash with Bayern Munich.
Newcastle United boss Alan Pardew has said he was "cheered up" after seeing Manchester United draw with Fulham on Sunday.
The Premier League champions were held to a 2-2 draw after Fulham equalised in the 5th minute of stoppage time at Old Trafford. The result leaves David Moyes' team 7th in the table, nine points off Champions League qualification.
Pardew, whose side are just four points behind the champions, said it would be "an achievement" if the Magpies finished above Man United this season.
The Black Cats have sold out their ticket allocation for the match against Manchester United. Sunderland AFC face them for the second leg of the Capital One Cup semi final on January 22.
Almost 9,000 Sunderland fans will make the journey to Old Trafford. Sunderland AFC is providing free coach transport to and from the game.
Sunderland beat Manchester United at the Stadium of Light in the first leg of the Capital One Cup last night (January 7).
The final score was Sunderland 2, Man U 1. But the teams still have to face each other in the second leg at Old Trafford.