The striker sustained his injury in April in the final minutes of Manchester United's 2-1 victory over Anderlecht in the semi-final of the Europa League.
Having signed on a one-year deal, the Swede was subsequently released in the summer as United were not prepared to continue paying a hefty salary to a player they couldn't use; however, there was always the suggestion that he would sign a short term deal once he proved his fitness, and the United manager confirmed that there have been conversations.
"The pictures of Manchester United players to me are, you know, wingers and wide men who are attacking, excitement, scoring good goals and Gareth Bale at Tottenham gave me that feeling and I thought when I joined Manchester United, the first player I wanted was Gareth Bale because he looked like a Manchester United player".
"Yes, we can (win the title), Europa League is not Champions League, obviously it is more difficult to win the Champions League than the Europa League but also motivation is higher, also my hard work last season to motivate the Europa League with ambition and commitment and responsibility, my work was hard at that level".More news: McGregor prepares for big bout with Mayweather
A lot of people have told me that United will win the Premier League this season. Mourinho is a fantastic coach and won everything wherever he went. "I'm really happy to start the Premier League this weekend because our pre-season was very complete and was a pre-season organised in a way where we start playing MLS teams and ended playing against the best teams in Europe".
However, Mourinho has lost a number of key players to long-term injury, including defenders Marcos Rojo and Luke Shaw, and wing-back Ashley Young.
'Twenty-five per cent means one of four.More news: Guardiola fast-tracks Man City starlet Phil Foden to first-team
"We have got a central defender who can play in many other positions, such as right-back and central midfield".
"What it means for me to be the Premier League champion?"
Mourinho believes United are capable of winning a title in his second season, but is not kidding himself over the challenge that awaits them domestically. "But the top seven, we are going to be in the four competitions and so there is no advantage for any one of us".
"The Premier League is what you all know", he said.More news: Coinbase becomes bitcoin's first unicorn as it raises $100M in new round
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