Should we be worried about David Ortiz? Ben Cherington isn’t. Given an entire winter to rest the strained Achilles that limited him to 90 games last year, Ortiz recently began running and may not be 100 percent when full spring training workouts begin next week. Still, Cherington, the Red Sox general manager, remains optimistic that Ortiz will be ready to play on Opening Day. “He’s on schedule,” Cherington said yesterday. “No concern here. Whether he plays in early spring training games or not is to be determined, but we’re not concerned.” Cherington visited Ortiz in the Dominican Republic last week and liked what he saw. He believes the slugger, who recently added running to his hitting and agility drills, will be ready for Opening Day. “Clinically, medically, he’s fine,” Cherington said. “Baseball activity, he’s still ramping up. We’ll know more when he reports.” Ortiz was in the midst of one of his best seasons, leading the American League in OPS, when he injured his Achilles while rounding the bases on an Adrian Gonzalez homer in July. He returned in August for one game, went 2-for-4 with a double, but felt discomfort in the foot and shut it down for the rest of the season. Despite appearing in only 90 games, he still ranked second on the team in homers (23) and fourth in RBI (60), while leading in batting average (.318) and OPS (1.026). Ortiz signed a two-year, $26 million deal in the offseason. Levangie returns Red Sox lifer Dana Levangie is returning to the field, joining John Farrell’s staff as bullpen coach. Levangie, 43, has spent the last eight years scouting. From 1997-2004, he served as bullpen catcher, and all told, he has spent the last 22 years in the Red Sox organization since being drafted in the 14th round of the 1991 draft out of AIC.