Tevez and Mancini were involved in a dispute in September, when Tevez refused to warm up during a Champions League match against Bayern Munich. Tevez later left City to return to his native Argentina, which cost him around $15 million in fines and lost pay.
City was unable to offload the disgruntled forward during the January transfer window, and he ended his holdout Tuesday when he returned to City.
Although City released few details about his return, Tevez was pictured on the team's website smiling.
Mancini previously said Tevez would not be welcome back to the Premier League leaders, but recently softened his stance, saying that an apology from Tevez would help end the saga.