INDIANAPOLIS — While general manager Ozzie Newsome has downplayed the need to restructure Joe Flacco’s contract to clear precious salary cap space for the start of free agency, the Ravens are pushing to keep free-agent offensive lineman Kelechi Osemele. According to NFL Network, the Ravens have offered to make the fifth-year lineman their second-highest paid offensive player behind their franchise quarterback. Head coach John Harbaugh wouldn’t delve into the specifics of the offer, but he made it clear what the Ravens are trying to do with Osemele, who started the final four games of the 2015 season at left tackle. “I’m sure he’s shopping the deal. I can tell you — Ozzie said it already — it’s a really aggressive deal,” Harbaugh said. “I think it shows a lot of respect to K.O. It shows him that we really want him here, and I hope he takes it.” Of course, incumbent left tackle Eugene Monroe remains under contract as he would enter the third season of a five-year, $37.5 million contract signed two offseasons ago. However, Monroe has started only 16 games over the last two seasons, and Newsome provided a lukewarm endorsement for him when speaking to reporters at