10:50am: A source tells Jason Beck of MLB.com that the report of Detroit's four-year, $48MM offer to Sanchez isn't accurate (Twitter link). I doubt those figures materialized out of thin air, but perhaps the Tigers never made a formal offer for those terms. The two sides are still talking, says Beck.
10:27am: The Tigers made Anibal Sanchez a contract offer earlier in the offseason worth $48MM over four years, reports Jon Heyman of CBS Sports (Twitter link). According to Heyman, Detroit was informed by Sanchez's agent that such an offer would "insult" the right-hander, who is seeking $90MM for six years.
A report last week suggested that the Tigers were still pursuing Sanchez, and that many executives believe the 28-year-old will land a deal of at least five years. That suggests that Detroit is willing to up its offer, though I'd be surprised if the team goes as high as the six years and $90MM Sanchez is seeking.