The Western Bulldogs are still investigating a scary incident involving Hayden Crozier during Thursday night's defeat to Carlton, where the defender unexpectedly fainted at half-time of the clash.

Crozier was substituted out of the game during the main break, having reported light-headedness before fainting. The club is not sure of the reasons behind why the medical incident occurred.

"He just fainted," Bulldogs coach Luke Beveridge said afterwards.

"We were all concerned about him. Our medical staff think he's OK. Not sure about the reasons why, but he just got light-headed and fainted.

"Obviously, straightaway, you make sure that he's looked after and I think he's in good hands. But that's all I've got for you at the moment.

"They're monitoring him, but he seems to be fine at the moment. Hopefully, it's nothing more than some light-headedness for some reason and he's OK. But we'll fill you in when we know a bit more."

Bailey Williams was substituted into the game in place of Crozier, with the Bulldogs then booting four of the next five goals after half-time to whittle a 31-point deficit back to just two kicks against a fast-starting Blues side.

Beveridge, who oversaw the dramatic match in 2016 where both Mitch Wallis and Jack Redpath suffered gruesome injuries that the coach later described as "tragic", didn't feel Crozier's incident had the same impact on his side.

"I'm not sure who was around him when it happened and I didn't see how it happened, so I couldn't tell you whether it impacted anyone. I'd say, given the way we played in the second half, that I don't think it impacted anyone's performances," Beveridge said.

"We have had situations historically … the main game was when Mitch Wallis broke his tibia and fibula and Jack Redpath did an ACL in the same game. That did have an impact, but that's the only time I can remember. I'm pretty sure tonight, the boys kept it together."