Warrington skipper Adrian Morley is due to undergo eye surgery on Monday - just 24 hours after making a stunning return to action in his side's win over Wigan.
Morley will miss Friday's date at Hull, when the Wolves could clinch the league leaders' shield, but should be fit for the Super League play-offs.
"They have put their finger on exactly what it was," said coach Tony Smith.
"He'll have a fairly minor operation on a little muscle in his eye and it's a relatively small recovery period."
Morley had not played since sustaining a head injury against St Helens in June.
But Wire coach Smith paid tribute to the way his inspirational captain shrugged off a 10-week lay-off to lead his team to the emphatic 39-12 win which enabled Warrington to return to the top of Super League.
And now the veteran England prop can undergo surgery after finally getting to the bottom of the mystery problem that has been causing him double vision.
Having been told that playing against Wigan would not cause him any further damage, he did as much as anybody to ensure the Wolves took over pole position.
"He looked like he hadn't missed a game," said Smith. "He was fantastic.
"I wasn't surprised but to come back and play as well as he did was a great achievement.
"The rest wasn't working for Moz and he saw a consultant and a surgeon midway through the week with fantastic news.
"We're so grateful to the doctors. They said he can't do any more damage to it and was welcome to play and I wasn't going to stand in his way."
Warrington, who last won the title in 1955, will finish top of the pile for the first time since 1973 if they beat Hull, whose play-off place is now secured, at the KC Stadium next Friday night.