There is not much on the market right now in the way of experienced and healthy centers as the Chicago Bears found out when they gave Olin Kreutz and ultimatum and he said “no thanks.”

But the Baltimore Ravens will check out Casey Rabach, according to John Clayton of ESPN. Rabach was let go by the Washington Redskins, and the Ravens have some concerns about depth and durability with knee issues plaguing veteran Matt Birk, who sat out practice Monday with a left knee issue.

Keep an eye on Kreutz too. His agent Mark Bartelstein said the 14-year veteran has a passion to continue playing after rejecting a $4 million, one-year offer from the Bears. But Kreutz is intent on finding the right situation, otherwise he’s likely to retire. Kreutz has missed only one start in the last 10 seasons when an appendectomy sidelined him in 2002.

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Brad Biggs covers the Bears for the Chicago Tribune