Usain Bolt has revealed that Borussia Dortmund will welcome him back for more training sessions in the future.

On Friday, Bolt spent time at the facilities of the Bundesliga side as he continues to consider trying to become a professional footballer after his retirement from athletics.

After his first session, Bolt stressed that the appearance is not a PR stunt, and that he is eager to impress staff at the German giants.

The 31-year-old told BVB Total: "I've talked to the club and I told them that I'm really serious about this.

"So they said I should come back for a longer period, do some more training and then they can assess me and tell me what level I can play at. So I'm looking forward to that and that's my focus right now."

Bolt left athletics having won 19 gold medals at the World Championships and Olympic Games.