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That is according to Richard Keys, who was informed of Cavani’s behaviour by his United “mole.”
Cavani made a surprise start for United on Saturday ahead of Cristiano Ronaldo, who was on the bench.
The 34-year-old Uruguayan striker has been battling for minutes at United after the return of Ronaldo and the arrival of Jadon Sancho.
Anthony Martial fired United into the lead in the first half at Old Trafford, but Cavani was pulled by Solskjaer in the 57th minute for Ronaldo.
Everton managed to break the deadlock in the 65th minute through Andros Townsend, who celebrated his equaliser with Ronaldo’s signature celebration.
Keys claimed that Cavani “wasn’t happy” with Solskjaer’s decision to withdraw him and “there’s trouble brewing there.”
Speaking in his blog, the former Sky Sports presenter wrote: “Solskjaer started his best centre-forward, but strangely chose to withdraw him after an hour. I’ve no idea why -- but more significantly -- Cavani was both puzzled and furious.
“My mole working near the dugouts tells me he stormed past Solskjaer when he came off, but quickly changed his mind about ignoring the manager and shook hands.
“But make no mistake -- he wasn’t happy and there’s trouble brewing there.”
Cavani has made four appearances for the club across all competitions this season, but he has not opened his goalscoring tally.
The Uruguay international, who inked a United contract extension in May, will see his current deal expire next summer.
And Cavani could leave Old Trafford in a bid to seek more regular playing time amid transfer interest from Real Madrid and Barcelona.
Cavani opened up about his lack of playing time and insisted that a player must “always be ready” to play when called upon by the manager.
The former PSG and Napoli striker told El Observador: “In football, you have to always be ready. It’s one of the keys at the top level.
“Sometimes you play more, sometimes you play less, managers make decisions, but that doesn’t stop the work to always be competitive.
“The league has just started and I have needed to be, not quite like last year, but I’m there to be a part of it.”
United will resume their Premier League campaign after the international break against Leicester City at the King Power on 16th October.