'He is available': Messi set to return after two-month lay off
"Yes, he is fine," Martino said before training Friday.
"He trained (Thursday), he is in the plans for the game. After training we will figure out the strategy for him, but he is available.
Inter Miami, who lead the Eastern Conference and are top of the overall standings, host the Philadelphia Union on Saturday.
Messi injured his right ankle during the final of the Copa America on July 14 when he helped Argentina to victory over Colombia. He has missed eight MLS games for his club and this month's World Cup qualifiers for his country.
"To get back the best player in the world to our team, which was already on a good run, we are all very happy with this situation," said Martino.