Mourinho believes the Swedish forward will not find it easy in the Premier League as he will be up against stronger teams.
"He's a great player. I have no doubt," he said. "But Sporting had a way of playing very much around him, very adapted. I don't know what Hugo Viana and Ruben [Amorim] initially thought; he's a player with great potential. But in England, he'll play against stronger teams, better players. Unfortunately, of the 3,400 lies that have been told about the transfer market, one of them is that he's going to Fenerbahçe. Unfortunately... So many lies, so much interest, so many people working for agents, for clubs... It's a war that's not my own."