Neil Lennon's Hoops take on the Dutch giants on October 22 at Parkhead and despite impressive yet unlucky losses to AC Milan and Barcelona, MacLeod feels the Scottish champions may have their work cut out for them with Ajax.
"Whereas Ajax will be fresh, they will be looking forward to playing here in a fantastic atmosphere, so they will possibly play as well as the other two teams.
"They have always been one of the top European clubs but I think people are looking at them and thinking they are maybe the weakest one in the group.
"I think they might surprise a lot of people when they turn up here at Celtic Park, they will still be a good football team. They have lost a couple of top players in the window but I still think it will be a tough game."
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