ORCHARD PARK, N.Y.—Receiver Lee Evans signed a four-year contract extension worth $37.25 million on Thursday in a deal that prevents the Buffalo Bills’ star from becoming a free agent after this season.

Evans, who is guaranteed to make $18.25 million in the new deal that runs through 2012, earned a significant raise over the base salary of $2.25 million he’ll make this season, the final year of the rookie contract he signed after the Bills selected him 13th overall in the 2004 draft out Wisconsin.

Re-signing Evans was considered the Bills’ top priority this year, and ne...

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