Marecic also could fill an inside spot in the Browns' 4-3 defensive scheme, but it's the notion of the 6-foot, 246-pounder blasting holes for 6-foot-1, 240-pound Peyton Hillis that might keep AFC North opponents up at night.
"I'm very, very excited to be a Cleveland Brown," Marecic told the team's official website Saturday, adding: "I always try to train to be a football player, but fullback may be the place I fit at home best."
Marecic said his playing both ways at Stanford was a coaches' decision: "That kind of came around my junior year. We were pretty thin at linebacker after a couple injuries about halfway through the season. I started to try to learn the defense and played here and there. We switched defensive coordinators for my senior season, and I spent all spring ball learning the new system."
Marecic's two-touchdown performance during a 37-14 victory at Notre Dame last season thrust him into the national spotlight. Marecic, in fullback mode, scored on a 1-yard touchdown run during the fourth quarter. Thirteen seconds later, Marecic -- at middle linebacker -- intercepted a pass from Dane Crist and returned it 20 yards for another score.
"It was a great, great game, very fun, and it was awesome to get a win over at Notre Dame," Marecic said. "I hadn't done that in my time. It was good to be a part of a team that could do that."
"I know Clay is very, very proud to be part of the Cleveland Browns family," said Marecic, who remains close to the Matthews clan. "They're huge football fans and growing up, the tradition was always evident. Hearing about the team. I'm very excited to join that whole tradition."
"We still keep in touch," Marecic said. "It's been fun, this process through the combine. We kept running into each other, and it's fun."
The Associated Press contributed to this report.