Inter Miami coach Javier Mascherano said Lionel Messi would be fit to face Porto at the Club World Cup on Thursday, despite showing signs of discomfort in training.

A video emerged of Messi touching his left leg during the session on Wednesday, but Mascherano confirmed the veteran forward was ready for Miami's second Group A match in Atlanta.

"On the trip from Miami to Atlanta I saw that came out in some places, but Leo is fit, he trained, he completed the whole session," Mascherano told reporters.

"He was touching his leg, sometimes people touch themselves, but there's no problem, he's fit and obviously he will play tomorrow."

The coach said Messi's former Barcelona team-mate Jordi Alba was available after missing the opening 0-0 draw against Al Ahly due to injury.

"We'll evaluate what's best for us, if he starts or not," said the coach. "Actually, I already know but I won't tell you."

Mascherano meanwhile said retaining possession would be the key against Portugal's Porto, regular Champions League participants who are likely to provide the MLS team with a stern test.