The Germany international wrote: “Felt great today! Team is in good shape, results will follow!”
Schweinsteiger joined Man United in summer last year but was plagued by injuries under Louis Van Gaal.
And he has been frozen out by new boss Jose Mourinho, who has not let him train with the first team this season.
But in a surprise U-turn, Mourinho allowed the former Bayern Munich star to rejoin training on Monday.
Man United are currently 8th in the Premier League after just one win in seven matches.
However, Schweinsteiger is not likely to return to the United’s first team any time soon, with Mourinho refusing to even let him appear for the reserves.
And he also missed out on United’s team photo as the club look to sell him in January.
But at least he got to celebrate his return to Manchester United training with his stunning wife Ana Ivanovic.
– The Sun