I always set myself new goals. I always want to do better than I did in the past. I always want to achieve things I never achieved before.

Every goal is hard work, especially in such an excellent league as the Bundesliga; or even take the Champions League.

I always set myself new goals. I always want to do better than I did in the past. I always want to achieve things I never achieved before.

We have our ambitions [in Dortmund Borussia], and of course I would love to win some titles after some years of finishing second or losing finals.

Few years ago I did 30m in 3.7 seconds. Whether that makes me quicker than [Usain] Bolt, I don't know! We all know Usain is the best.

I would love to have a race against Usain Bolt one day! It would certainly be a good challenge for me.

Didier Drogba and Samuel Eto'o, two fantastic African footballers. So successful. And very nice characters as well. I got the luck to know them personally. They helped me a lot.