Hoops boss Neil Lennon has consistently stated that the on-loan Celtic striker Mo Bangura would be best served not playing against his parent club in either of the crucial qualifiers.
Midfielder Joe Ledley was quoted as saying that if Bangura ''scored the winner and knocked us out of the Champions League, then it would be difficult for him to come back''.
However, the 24-year-old forward from Sierra Leone arrived in Glasgow on Tuesday for the first leg with the Swedish club's boss reiterating that he will play if required.
Before Bangura trained with his Elfsborg team mates at Celtic Park, Lennartsson said: ''Of course it is mind games. That is how we feel it is and mind games is a part of football at this level.
''So I don't pay attention to the mind games, they do what they think is best for them and we do what we think is best for us.
''I don't have any comment about how they will treat him next year. That is a question for Celtic.
''His work this year is to play football in Elfsborg.
''We don't change our way of working or our way of trying to get to Champions League because of what Celtic do.
''We have the full right to use him, we also want to play in the Champions League.
''We have invested a lot of money to go to the Champions League.
''This year we have taken care of him, he has played with us, trained with us, we pay his salary, so we have a responsibility for him this year.
''I have spoken with Mo and I cannot say that he hasn't been affected at all, of course he has been affected a little bit but Mo is a quite cool man.
''But the main thing is that he is a professional football player at his work.
''He is not a carpenter, a bus driver, a taxi driver or working in a hospital.
''He plays football and that is his job and for the moment he plays for Elfsborg.
''We have an important game and we can't see a problem in the contract for using him.
''We want to win the game. I don't have any problems with Celtic saying that they don't want him to play, that is normal, but we do the best things for Elfsborg.''
It appeared Lennartsson was trying his own version of mind games when he assessed his side's chances of an upset against the Scottish champions.
''We have been looking forward to the Champions League since we won the Swedish league last year on November 6,'' he said.
''But we feel we are big underdogs. We know Celtic is a good side but we feel we have a wonderful situation because we feel we can play totally without pressure, all the pressure is on Celtic.
''We know that they have already won their domestic league before it has started - almost - so the Champions League is very important to Celtic.
''So we feel it is a wonderful situation for us and we like that very much.''