Bayern Munich chairman Uli Hoeness says the club need to show they can compete in the UEFA Champions League, if they want to keep hold of Franck Ribery.
The French star is being strongly linked with a move away from the Allianz Arena this summer.
Ribery himself insists he is happy in Munich, but Hoeness accepts Bayern need to perform on the pitch in order to keep their prized asset.
Bayern hold a 2-1 lead over Fiorentina following the first leg of the UEFA Champions League first knockout phase tie.
"Fiorentina was strong in the first leg fixture, but I was not amazed by their play," said Hoeness.
"Why should we get afraid? We won that match. If we are advancing to the next round, doing a good job, seeing Franck (Ribery) playing well and he is grabbing that feeling, we have a chance at such a stage of the competition, then we have a better chance to see him remain.
"Should we lose out by three goals to nil, I would not bet on him staying on."
Ribery currently has 16 months left on his current deal at Bayern and has been linked with the likes of Real Madrid, Barcelona and Chelsea.