Neil Lennon’s men lost 2-1 in Perth in the Clydesdale Bank Premier League on Saturday and host Benfica tomorrow night in their first match of Group G, which also features Barcelona and Spartak Moscow.
Speaking at a Tesco Bank Football Challenge event at Hampden Park, former Celtic midfielder Paul Hartley said: “Celtic are coming off the back of a bad result against St Johnstone.
“They will forget about that and make sure they’re ready for tomorrow.
“It will be an important game for Celtic. If you can have a strong home performance then hopefully it will stand you in good stead.
“It’s a difficult group. There are quality teams there, but Celtic are in there on merit.
“They’ve shown they can go away from home now and win in Europe.
“It will be a great atmosphere. Champions League nights are always special and I’m sure Neil will have his team ready.
“Hopefully they can get a good result on Wednesday, get on the board with a good three points and take it from there,” added the Alloa Athletic manager.