Before his injury, the striker made a sensational start to his English career with three goals in five matches.
The striker -- who joined City in the January transfer window after they paid Palmeiras an initial £27 million ($33 million, 31 million euros) -- made a sensational start to his English career with three goals in five matches.
His hot streak was stopped in its tracks when he broke a bone in his foot against Bournemouth in mid-February -- he was expected to be out for between two and three months.
"Gabriel Jesus stepped up his recovery from injury today (Monday) when he returned to the training field for the first time since February," read the City statement.
"The early prognosis (of the injury) suggesting he could be out until the end of the season.
"He recently began working in the gym in a bid to keep his fitness levels high -– and this afternoon, on his 20th birthday, he returned to the training field just seven weeks after his initial setback.
"And although he didn't take part in full training, focusing instead on some light ball work, it's a sight City fans will nonetheless have been pleased to see
"We wish Gabriel well in his continued recovery and hope to see him back in a blue shirt as soon as possible."
His return comes at a timely moment for City manager Pep Guardiola, who is desperate to maintain his record of never going trophyless through a season with any club he has managed.
City's best hopes of ensuring that proud record stands is perhaps in the FA Cup where they face Arsenal in the semi-finals later this month. In the league they are 11 points adrift of leaders Chelsea.