Cousins received a heavy knock from Hawthorn forward Lance Franklin late in the third quarter of Saturday night's game.
He left the field aided by trainers, and sat out the final term after receiving treatment in the rooms.
Caretaker coach Jade Rawlings said Cousins remained a chance to make his second trip back to Subiaco, but would be assessed further during the week.
"It's hard to say, but the feedback I had just before I walked in was he will be fine, but we'll make those calls on Monday and Tuesday," Rawlings said after the game.
"He looked a bit groggy still after the game, but he sat through the meeting and seemed to be engaging reasonably well. I haven't had a full debrief on him yet.
"It was a pretty big hit and he looked like he was pretty keen to stay on, but with the way he walked, he was heading in a totally different direction to where the interchange bench was, which suggested he was in a bad way.
"It was a no-risk policy when considering putting him back on in the last quarter."
Rawlings is also expecting Daniel Jackson (ankle) and Shane Edwards (eye) to be available, but is unsure about Will Thursfield (shoulder) or Chris Newman (knee).
"Newman has a minor knee and we're not sure what the outcome will be for next week, but Jackson said he was fine," he said.
"[Thursfield] was an AC joint, we think, and I'm not sure if it's going to be operable yet."
He praised his players for "sticking to the task" in what he labelled "trying circumstances" towards the end of the game, when the Tigers had a heavily restricted bench.
He also said they had responded well to an honest week at the club following back to back heavy losses to the Sydney Swans and Collingwood.
"There have been unacceptable performances over the past two weeks, and we dealt with that on Monday," he said.
"It was a positive week for our leadership group. They were able to admit they were struggling mentally with where they were at, and I was probably looking to bring out the bat and crack it a little bit.
"We had a good open forum on Monday and they realised they had to accept responsibility for their performance and couldn't tuck it under the carpet.
"The way they performed this week on the track, and then they were able to commit their bodies tonight … the endeavour generally was there."
