ALLEN PARK — Lions center Dominic Raiola has signed a four-year extension that will keep him with the team through the 2013 season. The deal was announced Thursday.
 “He’s a guy that’s been a great leader for us on offense and in the locker room. He’s been a stalwart on the offensive line, outside of a hand injury last year, he’s been great in durability. He’s the exact kind of guy the organization wants as part of the nucleus of this team going forward,’’ said Tom Lewand, the Lions president.
   Raiola, who was a second-round draft pick (50th overall) by Detroit in 2001, said he doesn’t want to play anywhere else.
 “I worked hard for this and there are a lot of people that went into me getting this. For where we’ve come from we haven’t done anything yet. I’m excited to be here and really finish my career,’’ Raiola said after Thursday’s minicamp practice.
  For more on Raiola’s new deal see Friday’s Oakland Press.
— PAULA PASCHE