Cousins initially rated himself only a 50-50 chance to face the Power after leaving the ground during the third quarter of Saturday's loss to St Kilda.
“Ben will continue to work with the Richmond medical and fitness staff over the next few days, and we are hopeful he will be fit for this Sunday’s match against Port Adelaide,” Tigers football manager Craig Cameron said.
Cousins, 32, announced his retirement last week.
After Saturday's match, Richmond coach Damien Hardwick said Cousins would make his own decision on whether to face the Power in what would be his 270th AFL appearance.
“At the end of the day, Ben’s been in this league for what, 15 years? So he’ll make the call whether he’s right to play,” Hardwick said.
“If he’s right to play, he’ll play."
Hardwick said the club was determined to give Cousins the “best possible” send off.
“All we want to do is send him off with a win," Hardwick said.
"[To] sing that song one last time would be terrific for him.”
The Tigers and Power clash at 2.10pm at Etihad Stadium in the penultimate match of the home and away season.
