Kyle Walker and Nicolas Otamendi were both present at Manchester City training on Monday ahead of the Champions League game against Atalanta.
The pair missed City's win at Crystal Palace over the weekend but may feature against the Italians at the Etihad on Tuesday.
City have won both of their games so far in this season's Champions League and are top of Group C.
Atalanta meanwhile are making their debut in Europe's top club competition and have lost two out of two, conceding six goals and scoring just once.