Messi avoids serious injury
Messi hobbled off the pitch in pain just after hour-mark in Argentina's 1-0 win over Honduras in San Juan, with the Argentine Football Association (AFA) later confirming the captain suffered rib and back contusions.
The 28-year-old was visibly distressed after copping a knock to the lower-back area and receiving treatment on the ground before being substituted.
However, the AFA gave no indication on a recovery time ahead of Argentina's Copa opener against defending champions Chile on June 6.
Prior to Messi undergoing CT scans at a local hospital, Argentina coach Gerardo Martino admitted he was concerned about Messi.
"Messi had a nasty blow to the lower back and we are doing studies," Martino said post-match.
"I cannot give a diagnosis, it was very sore. He had a heavy blow.
"I have to wait for the diagnosis to give details, but we are always concerned about Leo."
After facing Chile, last year's runners-up Argentina take on Panama (June 10) and Bolivia (June 14) in Group D.