Wesley Sneijder scored his first goal for Galatasaray to spark a superb second-half comeback that saw the Super Lig leader overturn a two-goal deficit to win 4-2 against fourth-bottom Orduspor.
It looked set to be a night to forget for host Gala after falling behind to a farcical 15th-minute own goal when home goalkeeper
The visitor, who started the day two points above the relegation zone, then added to Gala's problems by doubling its lead on the stroke of half-time through
However, Gala fought back in emphatic fashion after the break with four goals in 20 minutes.
Inan then got his name on the scoresheet again - this time for his own team - with a fantastic 22-metre effort to make it 4-2 as Gala moved six points clear of nearest challenger Fenerbahce at the top of the table.
Chelsea goalkeeper Mark Schwarzer said he had fulfilled a lifetime's ambition by finally making his UEFA Champions League debut aged 41.