The Sierra Leone striker is currently on loan with Swedish side Elfsborg, who will take on the Hoops in the third round of qualifying, and is being touted to play if both sides make it through.
However, Lennon has re-iterated Celtic's stance that Bangura should not take part in the two-legged fixture.
"I think (chief executive) Peter Lawwell has spoken to Elfsborg. We have a good relationship with the club and we don't want that to change, but we're hoping that common sense prevails," said Lennon.
"Their coach has said he's their player but he's not, he's ours. We've loaned him there for a year with the intention of hopefully bringing him back a better player.
"It's one of those quandaries you can't foresee when these deals are done. It's now an impossible situation for the player.
"I've never had a situation in my time as a player when a loan player has actually played against his parent team.
"I will take a steer off Peter after he has spoken to Elfsborg.
"I will maybe speak to Mo, but I don't know how much pressure he is being put under and I don't want to put him under any extra pressure.
"I have made my own and the club's feelings clear."