Argentina's Angel Di Maria has defended Lionel Messi's displays at the Copa America, insisting the forward is performing "very well".
Messi has scored just once, from the penalty spot against Paraguay, in four games at the tournament, where Argentina reached the semi-finals courtesy of a 2-0 win over Venezuela on Saturday (AEST).
The Barcelona star has come under criticism for his underwhelming performances but Di Maria, who made his 100th appearance for his country as a second-half substitute against Venezuela, believes his contribution has been important.
"I think Leo is doing things very well," he told reporters. "He's not scoring goals like he usually does, but I think he's doing a good job.
"He's running and he's giving everything. He has to keep running and then the rest will come. I think he is doing very well."
Argentina face Brazil in a mouth-watering semi-final on Wednesday (AEST) and Di Maria knows his side will have to be at their best to overcome the host nation.
"With Brazil it's a complicated game, but I think all the teams make it difficult for you," he added.
"Brazil will play as our equals and they will have the home support. We have to try to play our way, do what we did against Venezuela and hopefully things will go well."