Schalke boss Keller wary of flexible Basel

Basel stunned Chelsea 2-1 in London on the opening Champions League matchday, coming from a goal down at half-time and scoring twice in the final 20 minutes.

Keller, who led Schalke to a 3-0 win over Steaua Bucharest in the first round of the Champions League group stage, has claimed he knows exactly what to expect from Murat Yakin's team, although he has warned his players that Basel can adapt their tactics throughout a match.

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