Chelsea have taken the first step towards a possible temporary move to Twickenham after making an approach to the Rugby Football Union
Chelsea live updates
Didier Drogba has asked for patience in his bid to show some of his former brilliance after returning to Chelsea.
Drogba was unable to add to his 157 Blues goals - accrued over eight years, from 2004 to 2012 - and Chelsea were punished by Schalke, who claimed a 1-1 draw.
"For a first game they were okay, kind of okay," Drogba, who left Stamford Bridge after scoring the decisive penalty in the 2012 European Cup win, told Chelsea TV.
"The good thing is no pain in the ankle, so now I can start working and training and improve the condition.
"I was feeling much better in the second half. I'm like a diesel, I need time."
"I had (chances), especially the one in the second half. It was a clear chance and I think it's unlucky.
"If I score there there's no more game. The fact that you don't score, they still believe in the equaliser and that's what happened afterwards."
Another disappointing night for the Premier League's best in Europe, as Manchester City lost to a late goal at Bayern Munich, while Chelsea could only manage a draw at home to another Bundesliga side, Schalke 04.