ISTANBUL — Schalke coach Jens Keller could hardly face a more daunting Champions League debut when his team visits Galatasaray for the first leg of the last 16 Wednesday. Keller was supposed to halt Schalke's midseason slump, but the interim coach has managed only one win from six games across all competitions since taking over from the dismissed Huub Stevens in December. Altogether, Schalke has only one win from 12, and its unbeaten record in the Champions League this season faces a somber test against a Galatasaray bolstered by the recent signings of Didier Drogba and Wesley Sneijder. Drogba, who won the competition with Chelsea last year, scored a spectacular header five minutes into his debut at Galatasaray Friday, in a move instigated by Sneijder, a 2010 winner with Inter Milan. "Both of them have quickly merged and integrated with the team," Galatasaray coach Fatih Terim said. The Turkish champion recovered from a poor start in the Champions League with three straight wins to finish second behind Manchester United in Group H. Galatasaray leads the Turkish league by six points with five wins from its last eight games, in sharp contrast to Schalke. — AP