The 27-year-old is said to be a key player for Luciano Spalletti, with the club doing all they can to ensure that he snubs a move to the Premier League.
However, Italian publication Tuttosport claims via Football Italia, that the Serie A giants could decide to part ways with the midfielder if a bid around the mentioned amount is made.
He joined from Cagliari for only £15million back in the January window of 2014, but given his recent performances, he is now believed to be worth double the amount.
Apart from the Blues and United, Italian giants Juventus are also amongst the teams monitoring his situation as they look to reinforce their squad in the summer.
The Belgium international has already featured 35 times in all competitions for his side this term, so far managing to score three goals while providing another two assists.