The Hoops go into the game on the back of a morale-boosting 2-1 home win over Ajax in the Champions League in midweek.
Midfielder Beram Kayal has a thigh complaint but should be okay and right-back Mikael Lustig should shrug off an ongoing hip problem but Derk Boerrigter (ankle) and Kris Commons (hamstring) remain out along with long-term injured Adam Matthews (collarbone) and Steven Mouyokolo (Achilles).
The Parkhead boss is glad the game has been moved to the Sunday as he juggles with his squad again.
"It is just a huge volume of games and it has been for quite a while," said Lennon.
"It was just a short break in the summer. We came back early and we were playing (Champions League) qualifiers in mid-July and I know I sound like a broken down record, but this Thistle game is the 20th competitive game already and that's quite a start to any season.
"It is a great help having the game on the Sunday because it gives us that extra day for the players to get that recovery in and training has been quite light.
"But off the back of a brilliant win, the players will be really looking forward to the game."
Meanwhile, Hoops defender Virgil van Dijk will go into the unknown when he visits Firhill, with the Dutchman admitting that he knows nothing about the Jags.
However, the 22-year-old knows plenty about Ajax and takes no notice of the noises coming from Holland which claim Celtic were lucky to get their first three Champions League Group H points in midweek.
"Everybody thought that Ajax were the better side and we won with luck but I think we deserved the win," he said.
"Although we didn't create a lot of chances, you could see and feel that Ajax wouldn't score a goal until they got one in the last minute.
"They had a lot of the ball and we knew that before the game.
"But a lot of ball possession doesn't win games and that's what you saw on Tuesday.
"If we get a result in Amsterdam (in the return game) we have a good chance of going to the next round, but Sunday is the next game that is coming and we will focus on that first."