Mino Raiola has made his first public appearance since Romelu Lukaku expressed his reluctance to sign a new contract at Everton, with the agent spotted entering the Manchester United team hotel.
The 23-year-old striker announced earlier this week that he will not sign a new five-year contract thought to be worth around £140,000 a week.
The Blues are said to be closely monitoring the contract situations of two star players at Goodison Park.
Koeman said he was far from pleased with Lukaku's comments but would not drop the Belgian striker, who is the league's joint-top scorer with 19 goals so far, for Saturday's match against third-bottom Hull City.
"To do that, you need the platform to show yourself", he said when asked about his desire to be ranked along with the world's best forward.
Mourinho later emerged himself smiling while Raiola darted off unseen by waiting photographers.
Sky Sports News HQ's Merseyside reporter Vinny O'Connor takes a closer look at Romelu Lukaku's contract situation at Everton...
"Football is a business, you make decisions".
Everton manager Ronald Koeman has admitted that it will take more than one season for the club to establish themselves as top-four contenders.
"The team needs Rom, and to score goals Rom needs the team".
Everton fended off his former club Chelsea last year but even with two years left on Lukaku's contract they may find it more hard this summer. The Spaniard is unhappy with a number of his current players and is eager to generate good value from them to bring in reinforcements.
"Ultimatum is strong, I don't like that word, it's not like that".
'Then you are talking about Champions League and whatever types of games. Also, Everton will not want to lose two of their best players in one transfer window and you can expect them to fight hard to keep them.
Dembele joined Celtic on a free transfer from Fulham last summer but could now fetch a transfer fee as high as £40million after his superb debut season in the Scottish Premiership.