Unfortunately, getting this magical addition is going to be a lot harder than usual. Montreal only has about $1 million in cap space with very little wiggle room even with potential players going on LTIR. There also isn't much on the free agent front. Only way this looks possible for Bergervin is via trade. That package would need to be a good one though since it doesn't look like there's any puck moving d-man on the trading block either.
One of their coveted top prospects, a high draft pick and a solid position player should do it for Bergervin. Who we all know isn't shy to make big trades like this happen, even more so when it's been a dire need for his team for quite some time now.