Celtic have been backed to respond from their loss at St Johnstone and make a strong start to their Champions League campaign.
Neil Lennon's men lost 2-1 in Perth in the Clydesdale Bank Premier League on Saturday and host Benfica on Wednesday 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 Wednesday night.
"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."