'Ikale Tahi number eight Viliami Ma'afu is in doubt for Thursday's Pacific Nations Cup rugby clash against the USA.
The 33 year old took a knock to the shoulder during Tonga's come from behind 28-18 victory over Canada at the weekend.
Winger Fetu'u Vainikolo also came off in that game but Tonga Rugby's High Performance Manager, Peter Harding, says it was just a precaution and neither injury is serious.
"There's a scan or two to be had this afternoon. We're pretty sure Fetu'u has been passed fit [but] we've just got to get the scan for Viliami and make up our mind whether we play him or whether it's worth risking him. It could have just been a stinger but we need to take precautions first and have a few scans to find out exactly what the problem is, but it's not serious and it certainly won't affect his chances going into the World Cup".
In the other PNC matches from the weekend the USA beat Japan 23-18 and Samoa and Fiji drew 30-all.
Tonga came from behind to beat Canada 28-18 in the Pacific Nations Cup. Photo: Jeff Bell / World Rugby