Sergio Perez to stay in hospital

MONACO -- Mexican driver Sergio Perez will remain in the hospital for another night as a precaution after sustaining a concussion and sprained thigh from a crash Saturday during qualifying for the Monaco Grand Prix.

He spent a "good night" at Princess Grace Hospital, underwent further tests and is to have a scan Monday, his Sauber team said in a statement Sunday.

Perez appeared in good spirits, posting a message of thanks to his fans on his Twitter page and saying he expects to be racing in two weeks at the Canadian Grand Prix.

"Thanks for your support. In this moment thanks God all ok. Can't race (in Monaco), but c u back in Montreal," he said.

Perez lost control of his Sauber coming out of a tunnel section of Monaco's twisting circuit. The front of his car slammed into the tunnel's barrier before spinning and crashing into a tire wall.

There were two other crashes Saturday. Mercedes driver Nico Rosberg and Hispania's Vitantonio Liuzzi were both unharmed after crashing in practice.