The United manager believes Ibrahimovic still has unfinished business in the Premier League despite the serious knee injury that cut short his first season in England.
In his second year at Porto, Mourinho announced himself on the world's footballing stage by delivering the Champions League to the Portuguese club in the 2003-04 season, earning himself the Chelsea job.
"Manchester came to me, they talked with my agent, but nothing happened, because Chelsea would not negotiate me in any way and I'm very happy at Chelsea". They open with West Ham at home before a trip to Swansea and then play host to Leicester before the global break and it would not surprise if they topped the table with three wins as we start September. Lukaku guarantees goals for Mourinho, having been second highest scorer in the Premier League last season for Everton.
"It's not something urgent, it's nothing that you are desperate to have it done or not done".
New £75 million striker Romelu Lukaku has taken the Swede's No. 9 shirt but on the eve of the new season, Mourinho has confirmed United are in talks with Ibrahimovic about signing a new deal once he is fully fit.More news: US stocks slip amid heightened US-North Korea tensions
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Defeat by Real Madrid in Tuesday's UEFA Super Cup match in Skopje was a setback, but Mourinho says his team are ready for the new season.
"But we have lost important players to injury too, such as Marcos Rojo, Ashley Young, Luke Shaw, and Zlatan Ibrahimovic".
Mourinho has indicated that he wants a fourth signing before the transfer window shuts on August 31, as he needs a winger to bolster his squad.
"Any position I get asked to play, if the coaches think it's right, then I'll give it a good shot", he said. I'm not in a position of crying, of moaning, protesting. We got a central midfielder, a striker, obviously the 25 per cent would be for a player from the sides, but we have players. The 25 per cent would be for a player for another position, playing from the sides.
'But we have players and if we cannot strengthen the team in these areas we have people we can trust and go for it'.