http://www.hockeyinsideout.com/news/...-months-report

Canadiens prospect Louis Leblanc is facing four to six months of rehab after arthroscopic surgery on Tuesday determined a shoulder injury was worse than first thought, according to reports.
The surgery was done in Pensacola, Fla., by renowned surgeon James Andrews.
Leblanc was injured during the Quebec Major Junior Hockey League season, but played through the injury until the Montreal Juniors were eliminated from the postseason in the second round.
Had the injury not been as severe, the Pointe Claire native would have only needed four to six weeks of rehab.
If Leblanc, the Canadiens first choice, 18th overall, in the 2009 NHL entry draft, misses the minimum four month, he would be ready to participate in training camp in September. A six-month rehab means he will be out of action until November.
In his first season with the Juniors, he recorded 26 goals and 32 assists in 51 games. The 20-year-old also won a silver medal at the 2011 World Junior Hockey Championship with Team Canada.

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Never good news for a developing prospect.