Usain Bolt’s coach is worried that going for the sprint double in the Beijing Olympics could hurt the 100-metre world record holder’s chances of winning his preferred 200 race.

The Jamaican sprinter has said he wants to compete in both, but is leaving the final decision to coach Glen Mills.

“You have to ensure that you are not going into it just because there is a chance of glory, you have to go there knowing that your chance is solid,” Mills said after Bolt’s 200 victory Saturday at the London Grand Prix.

“I definitely want the double in Beijing, but my coach makes all my decisions for me,” Bolt said. “I’m just waiting on him to decide. I’m definitely ready — I’ve been ready for two months now.”