Bayern Munich captain Mark van Bommel has not penned in a win for Wednesday night's Champions League clash with Fiorentina at Allianz Arena.

The German club has won their past 12 matches in all competitions whilst their opponents have taken just one point from their last five outings but van Bommel, along with manager Louis van Gaal, is refusing to believes his team has already won the match.

"Only washing machines come with guarantees," said van Bommel. "We know we're on good form, but it can vanish very quickly."

"Fiorentina are a very good team, as they've shown in the Champions' League," added coach van Gaal. "They took more points than we did in the Group Stage.

"I'll be very, very pleased with a 1-0 win."

Fiorentina manager Cesare Prandelli believes the absence of striker Adrian Mutu for will make no difference to the team's fortunes.

The Romanian is out of action because of a doping offence after testing positive for an appetite suppressant but Prandelli prefers not to worry about who is out of action, rather the players he has out on the pitch.

"Mutu? We also missing Cristiano Zanetti and Alessandro Gamberini, who were also important players. It's no good thinking about who's missing," Prandelli told reporters.

"We have to re-find our squad's spirit," he added. "We are taking on a very strong team and we have to play with enthusiasm and the will to show that we deserve to be here."