Source: Raiola's deal worth $20 million
Detroit Lions center Dominic Raiola signed a four-year extension Thursday that will keep him under contract through the 2013 season.
Raiola, 29, is entering his ninth season and, as their starting center since 2002, is one of the Lions' most tenured players.
According to a source, Raiola became the fifth-highest-paid center in the NFL by agreeing to a four-year, $20 million deal, of which $9 million is guaranteed. With the new contract, Raiola will make $13 million this year.
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