Steven Gerrard scored a last-minute penalty as Liverpool registered a gritty 3-2 win to remain fourth.
The sacked coach said League Managers Association has "already written to the club asking for a proper explanation".
The midfielder's absence will be a blow to Arsenal's title aspirations.
However, United are yet to make a formal offer and Mata has to inform Jose Mourinho of his desire to move.
Willian has brought a dynamism to the attacking midfield that has had Mourinho drooling and helped lift Chelsea into 3rd place.
Riding the wave of a five-match winning streak, Chelsea face United on Sunday, while Man City take on Cardiff.
Stoke City are set to punish Jones with a fine of two weeks' wages, worth an estimated Â£60,000, for his absence.
Olivier Giroud ensured that Arsenal will finish the year at the top of the Premier League standings by scoring the winner for the Gunners in a 1-0 win at Newcastle.
Ozil suffered the injury in their 3-1 win over West Ham United on Thursday.
Also, Chelsea visit Stoke City and third-placed City meet Southampton in an away game.
This is City's only second away win this season, which keeps them six points behind leaders Arsenal.
Despit the win, Jose Mourinho's side remains four points behind Premier League leaders Arsenal.
The win helped Arsene Wenger's team retain a four-point lead atop the standings.
The Uruguay striker fired four goals, including a first-half hat-trick that saw Reds go 3-0 up inside 35 minutes.
Everton got their first win at United in 21 years, thanks to Bryan Oviedo's 86th-minute strike.
Mourinho was ordered to the stands by the referee for protesting during Chelsea's 4-1 win against Cardiff on Saturday.
"I've thought for years and years that British players are technically as good as Europeans," says Brendan Rodgers.
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