Many people doubted whether the Swede would be able to cope with the demands of the Premier League after making the move from PSG to Man Utd at the age of 35.
However, Ibrahimovic has impressed since making the move to Old Trafford, scoring 12 goals in 17 Premier League games and 17 in all competitions.
After an impressive first half of the season, Jose Mourinho is confident that the former PSG and Barcelona forward will extend his stay at Old Trafford.
"It is activated in his brain and it is activated also in my decisions and in the owners' and the board's. So it is no problem," said Mourinho.
He added: "I am not really surprised because he is a very intelligent guy and a very proud man.
"He decided to come to Manchester United and to the Premier League, to a club with the level of expectation of Manchester United, in the most difficult league in the world for a striker.
"When he decides to come here, it is because he knows he can do it.
"When we contacted him and he said, yes, he will come, I was sure that he was not coming here to leave the Premier League without proving himself.
"To leave the Premier League having failed at Manchester United? No way.
"When such a guy decided to come, I was completely clear that he would be ready and he is ready for more next season. He will be here again".