Zlatan Ibrahimovic trains in an altitude mask during the international break

Zlatan Ibrahimovic is gearing up for a crunch week of games for Manchester United – by training in an altitude mask.

The 35-year-old is retired from international football but there will be no let off in his rigorous conditioning regiment despite the absence of his teammates.

Jose Mourinho ‘s side travel to Liverpool a week on Monday before facing Fenerbahce in the Europa League on Thursday followed by a Sunday visit to Stamford Bridge .

And the Swede was keen to show the other United stars he isn’t slacking off by posting a message on Instagram, alongside a picture of the striker looking spookily like Tom Hardy’s Bane from The Dark Knight Rises perched on a treadmill.

rex The 35-year-old striker resembled Tom Hardy’s Bane character from The Dark Knight Rises Ibrahimovic faces his toughest week as a United player with games against Liverpool, Fenerbahce and Chelsea

"There is no free time, there is hard work and objectives," he wrote.

Ibrahimovic’s commitment will come as no surprise to his new colleagues, who have noted his impact at Old Trafford already.

"He’s unbelievable," said Spanish midfielder Ander Herrera last week. "He doesn’t lose one training session. He trains every day at his best trying to get everyone at their highest level.

"He is very, very aggressive and demanding but in a good way because every day he wants to win every training session and he wants everyone with him to win to keep working so we are very lucky to have Zlatan with us.

"If you see a game and you didn’t know Zlatan’s age you could think he was only 28 or 29 and that is good for us.

"You see the way he behaves. The way he trains even before the session, he is always stretching, taking care of his body, so that is the way a professional player has to behave.

"When I was not in a top team I used to admire these kind of players and I wanted to be one of them one day, being at Man United eight or nine season, but it is not easy.

"He’s an example for every one of us not just the young players. I am not young, not old, I’m in the middle at 26 and he is an example for me as well. When you behave as a professional you can be at a top club at 35."