Chris Bosh will not play in the Toronto Raptors' exhibition game against Real Madrid tonight. The all-star missed his second successive day of practice with an unspecified problem with his left knee.

"I'm sitting out right now until I heal 100 per cent and make sure I'm right for the season," Bosh said.

Bosh said his knee has been bothering him for about a week.

"I really don't know what caused it. It could be one of those chain reactions the trainers are always talking about," he said. "I'm just going to sit down for a moment and come up with an approach to handle it the right way."