Schalke got the result they were looking for in their Champions League qualifier first leg against Atletico Madrid on Wednesday night, but an injury to striker Jefferson Farfan tarnished the victory.
The Peruvian had to be substituted after hurting his shoulder in a clash with an Atletico player during his side's 1-0 victory and risks missing the start of the Bundesliga season as well as the return leg in Spain.
'He played a very promising game and it is certainly depressing that he will not be available for the coming games,' said general manager Andreas Muller on the club's website.
Farfan was replaced by Halil Altintop in the 70th minute and, with Gerald Asamoah, Ivan Rakitic and Kevin Kuranyi all seeing some action, Muller is not too concerned about losing the club's big summer signing for a few weeks.
'We have enough strikers in our squad to compensate,' he added.
It was a defender, Christian Pander, who made the difference on Wednesday with a fine free-kick on the half-hour mark deciding the game in the Royal Blues' favour and putting them in the driving seat for the second leg.
'We said we wanted to win and not concede and we have done that,' added Muller.
Coach Fred Rutten was a little more reserved in his assessment of the result, saying: 'It is not super, but we have not conceded a goal so it is okay as a result.
'Still, it is going to be very hard in Spain.'
The return leg takes place at the Vicente Calderon on August 27, four days before the start of the Spanish Primera Division, and four after Schalke's second match in the Bundesliga.