Brazil defender Thiago Silva believes Argentina’s Lionel Messi could be saving his best form for Wednesday’s Copa America semi-final.
Hosts Brazil meet Argentina in Belo Horizonte (01:30 BST) for a place in Sunday’s final.
Messi has scored once in the tournament – from the penalty spot – and has said he is not playing at his usual level.
“He is the best player in the world and he still could spring to life,” said Paris St-Germain defender Silva.
Argentina have reached four of the last five Copa America finals but have not won the tournament since 1993, and have struggled to hit top form in Brazil.
They opened in Brazil with a 2-0 defeat by Colombia in Salvador before Messi’s penalty earned a 1-1 draw with Paraguay.
Argentina only advanced to the quarter-finals after beating Qatar 2-0 before they saw off Venezuela by the same score.
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