The Argentine superstar missed both of Argentina's friendly wins over El Salvador and Ecuador in the past week due to a foot injury. Last week he helped to get Barsa to win against Real Madrid.
However, Gerard Pique has revealed that he has spoken to his team-mate, and is confident he will feature on Sunday.
"I am optimistic about Messi, I have spoken to him," Pique said.
"I think that he can play at Balaidos (Celta's stadium).
In the end it is up to how he feels during the rest of the week. The medical staff are those who should decide. My feeling is that he will play."
