Still, Inglis received a round of applause from teammates when he joined them at their last training session before they fly out to Sydney.
It emerged Inglis had to undergo blood tests on Friday.
"The doc has been looking after GI very closely," Thaiday said.
"Tonsillitis they said - I thought that was only for little kids but he's been in hospital for three days so it must have been bad."
Queensland coach Mal Meninga tried to play down Inglis' hospital stay after confirming the veteran centre would play Origin I.
"It's just precautionary really," he said. "The doc's normally conservative with these sorts of illnesses and there's been an epidemic of tonsillitis and viral flu at the moment so just being precautionary to make sure we look after one of our very valuable players.
"He's back with the team, he'll be travelling with the team and he'll train Tuesday and play Wednesday. He's still getting over the aftermath of tonsillitis but he'll be fine for Wednesday."
- AAP