Buster Olney is saying the Red Sox think so:
Heard this: There are concerns within the Boston organization about whether Jason Bay would hold up physically through a multi-year deal.
I suppose that’s always a concern when you sign a guy to a long deal -- and Alex Speier at WEEI.com is reporting that it’ll take five years to get Bay right now -- but the guy hasn’t had too many health issues to date. He had some hamstring problems late in the season, but he hasn’t been on the DL in five years.
One questions whether it’s ever a good idea to give a guy in his thirties a five-year contract, but I don’t know that Bay is any greater an injury risk than anyone else. This could be something someone with the Red Sox is floating simply to pressure Bay a bit.