The Scottish international missed the last two league games after accumulating ten bookings for the season but after serving his ban he is now available for the game at the Den.
"With the suspension it was a bit gutting," said Hanley. "It came on kinda quick, I never realised I'd racked them up that quickly until maybe a couple of games before.
"So obviously it was gutting to miss out but the ban is over now and I now have to try and get myself back in the side.
"I suppose the rest is good but when you are in the team you want the momentum of keeping in the team and keep trying to perform well."
Rovers' game against Millwall is their game in hand against other teams around them in the bottom half of the team with Hanley knowing the importance of making it count.
"We are at the wrong end of the table so we have to concentrate and take each game as it comes starting with the next one against Millwall on Tuesday night where hopefully we can pick up a win there," added the defender.
"It is our game in hand so we have to make that count, we have to keep looking forward and be positive. These games are massive for us, we have to stay in this division."
The match against the Lions brings memories of the FA Cup quarter-final defeat back into focus, which Hanley admitted was hard to take.
"It was a quarter-final and a chance to play at Wembley so it was hard to take, the emotions afterwards are hard to explain, you don't get too many chances to play at Wembley so it was gutting.
"Now we've the league game, we have to be looking for the three points, that is our focus."
Tickets for the match will be on sale from the Den on the day of the game priced £26 Adults, £17 for Seniors over 60, £13 for Under 16s and £7 for Under 12s.