The health of defenceman Andrei Markov is the No. 1 concern as the Canadiens gather at their training facility in Brossard Friday for the start of their main training camp. Physicals and fitness testing are on the schedule for Day One and a setback in his rehabilitation from knee surgery will limit Markov's participation when the players hit the ice Saturday. Markov, who underwent his second major ACL reconstruction on his right knee in December, skated on his own in Brossard Thursday and it was obvious that he's far from 100 per cent.