The World Player of the Year, level on 27 goals with Real Madrid forward Cristiano Ronaldo, pulled out of Argentina's friendly against Costa Rica on Tuesday as a precaution.
He had tests on the adductor muscle in his right leg on Thursday at a clinic in the Catalan capital as Barca prepare to defend their five-point lead over chasing Real Madrid at third-placed Villarreal on Saturday.
"Once the tests were completed doctors ruled out any muscle injury," Barca said.
"The player will have physiotherapy between now and Saturday, when a decision will be taken on his participation in the Villarreal game."
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