The Fir Park outfit are licking their wounds after their shock 1-0 Scottish cup exit to SPFL League Two minnows Albion Rovers.
And the Hoops boss fears Well will be desperate to take some of their frustrations out on Celtic.
Motherwell twice beat Celtic at Fir Park last season and the Hoops boss is eager for his side to maintain the tempo they showed in the 7-0 demolition of Hearts.
"It is a dangerous game for us," said Lennon."We know they'll be hurting and they'll be desperate to make amends.
"They'll look at the game as the ideal scalp to take in order to atone for that cup result and it is something we have to be very mindful of.
"We know what it's like to be coming off the back of a really disappointing result and it can make a team very dangerous.
"They'll be feeling much the way we did last week and they'll test us, that's for sure.
"But we set a pretty high bar for ourselves at the weekend. That is the level that we want to aim for all the time.
"We're pleased with the consistency that we've shown so far in the SPFL and we'd like to keep that going as we head into what is a traditionally busy time of year."
Meanwhile, Elfsborg have ruled out signing Mo Bangura on a permanent deal.
The Sierra Leone internationalist will return to Lennoxtown after playing the final Europa League group game against Standard Liege on on December 12.
Bangura can return to train with Celtic upon the expiry of his deal with Elfsborg, but will not be formally re-registered with the club to play in matches until January 1. The 24-year-old has made 16 appearances for the Glasgow club but has failed to score in a competitive game.
"He has one game left here and then he belongs to Celtic," said Elfsborg chairman Bosse Johansson .
"What Celtic will do, I do not know. Either he will stay there or they may loan him out again.
"At the start of the season, we made a special effort to try to reach the group stage of the Champions League. We did not succeed, but part of that effort included borrowing Bangura during the year. The plan has not changed."