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Luke Beveridge is hopeful Hayden Crozier will be cleared of any major health concerns after the Western Bulldogs defender fainted during the AFL loss to Carlton.
Crozier had his heart checked by paramedics in the change room after the second-quarter incident, which led to him being substituted out of Thursday's match.
But the 28-year-old was initially cleared by medical staff and appeared fine after the match, according to Bulldogs coach Beveridge.
"He just fainted," Beveridge said in his post-match press conference.
"We were all concerned about him and our medical staff think he's okay.
"We're not sure about the reason why but he just got light-headed and fainted.
"Obviously, straight away you make sure that he's looked after and he's in good hands but that's all I've got for you."
Beveridge was unsure if Crozier would need to be taken to hospital for further observation.
"They're monitoring him but he seems to be fine at the moment," Beveridge said.
"Hopefully, it's nothing more than light-headedness for some reason and he's okay."
Key forward Aaron Naughton copped a corked right calf in a marking contest and was troubled throughout the second half as the Blues resisted the Dogs' fight-back, winning 16.6 (102) to 13.12 (90).
"I thought he might've been out for the game but it was one of those corks that you get when you haven't got the muscle flexed," Beveridge said.
"It gets in really deep but he was able to run and we've just got to make sure that it doesn't bleed too much and hopefully he'll be right next week."
Beveridge is also hopeful gun midfielder Bailey Smith will be fit to return against Sydney at Marvel Stadium in round three.
Smith sat out the Carlton clash with a hip injury.