The Swedish striker signed another one-year deal with United on Thursday, returning to the English club that released him during the summer while he recovered from a serious right knee injury.
The 35-year-old Ibrahimovic sustained the injury in a Europa League quarterfinal match against Anderlecht in April, ruling him out of the last month of the season.
He has been undergoing rehabilitation at United over the summer and has shown enough positive signs in his recovery to convince the club he is worth a new contract.
On Sunday, however, Ibrahimovic posted a video on Instagram of himself kickboxing, during which he kicked a punch bag hard with both legs.
But he will soon have some competition in attack from a player who top-scored for United last season with 28 goals in 46 appearances, including a double in a 3-2 win over Southampton in the English League Cup final.
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