All Blacks star Tamaiti Williams has been ruled out of the rest ‌of the Crusaders’ Super Rugby Pacific season with a ‌spinal infection and is no certainty to return to ‌action in time for the start of the Test season in July.

The 25-year-old loosehead prop is in hospital after being diagnosed with discitis, an infection in ‌one of ‌the ⁠discs in his spine, the Crusaders said ​in a statement on Monday.

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His absence is a blow for the defending champions, who are sixth on the table after a slow start.

“His return to rugby beyond (the ⁠season) remains unclear and ‌will ​be guided by further medical advice,” the Crusaders said.

Williams ​said he had ‌a sore back for a couple of weeks ​before going in to hospital for scans.

“I’m feeling gutted, but I’m also grateful that the news ​isn’t ​as bad as ​what it could be,” he ‌said.

“I’ve been told I’m going to make a 100 percent recovery, so I’m thankful for that.”

The All Blacks start the Test season in July with matches ​against France, Italy and Ireland as part of ​the inaugural Nations ⁠Championship.

“Even though my season’s done, I’ve got full faith in the boys that they’re going to get the job done,” Williams said.

“It’s an exciting year for us with the new stadium and a lot of big moments coming up. I’ll be backing the team all the way.”