PORT Adelaide hard-man Tom Logan says Adelaide's Kurt Tippett needs to listen to what his body tells him this week as he recovers form a third concussion in five weeks.

Logan has built a career around a reputation as a non-compromising small defender, but his style of play has come at a price.

On the eve of his 100th AFL game, Logan admitted he couldn't remember how many times he had been knocked out and that since the start of last season he had received 45 stitches.

Regardless of the impact that caused the concussion, Logan said he was always aware of what his body told him and played accordingly, urging Tippett to do the same.

"Head knocks are always dangerous and he probably knows more than anyone how he feels and if he should play or not," Logan said.

"There's been times in my career when I've probably copped bigger knocks and felt OK…and other times I've copped a knock that's not as big and ruled myself out.

"He'll go out during the week at training and see how he feels and I think that's more important."

The 27-year-old defender said delayed reactions from concussions had caused him to miss several games in his career.

He complained of his reaction to light and headaches but insisted there were no lingering effects.

While Logan spoke of the importance of listening to his body, he said the decision to take a week or two off was always made in consultation with the club doctors.

"It was always a joint decision, [the doctors] always supported my decision and how I felt and they're obviously very smart people and they know what they're talking about," he said.

"Headaches and a bit dazed…driving at night and the car's lights, reactions to light is often a problem.

"That's where my biggest trouble came from I missed a few games over the years just through that."

Despite his countless head knocks, Logan said he had never suffered as many concussions in quick succession as Tippett.

Tippett was subbed out of Adelaide's match against West Coast last weekend after a head collision with Beau Waters.

He was subbed out of Adelaide's round 13 match against North Melbourne and in round 15's Showdown he clashed heads with Logan.

Logan said he wasn't in a position to recommend Tippett miss a certain number of games to restore his health, as the best judge of his wellbeing was the man himself.

"I've sort of lost count," Logan said of his own head injuries.

"[I've] never [had] three in five weeks, that's quite dangerous.

"I can't put an answer to that because I don't know how he feels. It's pretty much up to him and how he feels from training and how he pulls up."

Harry Thring covers Port Adelaide news for AFL.com.au. Follow him on Twitter: @AFL_Harry