Dallas Cowboys' rookie Micah Parsons is already one of the biggest stars in the National Football League.He was having a historic rookie season, dominating rivals on the line of scrimmage and becoming one of the finest headhunters in the NFC.Unfortunately, it seems like his historic run could come to an end before he enters the record books, as he's likely to miss Week 18's game against the Philadelphia Eagles after being placed on the reserve/COVID-19 list earlier in the week.Parsons Could Miss The Season FinaleNow, the rookie out of Penn State will join fellow LBs in the protocols amid the Cowboys' recent outbreak:"Micah Parsons becomes the third Cowboys linebacker to enter COVID-19 protocol recently. Francis Bernard and Keanu Neal [sic] the others. Leighton Vander Esch and Luke Gifford are the only LBs on 53-man roster who will practice today," tweeted Michael Gehlken of the Dallas Morning News.Missing their best defensive player is going to be a big blow for America's Team, even if they've already clinched a playoff spot.The Chances Of Playing Are SlimAt the end of the day, his availability will depend on whether he tests positive and he's fully vaccinated or not:"Parsons can return in time to play in Saturday's game if he's fully vaccinated," reported Chris Cwik of Yahoo Sports. "Players who are fully vaccinated can still test out of the NFL's protocols if they turn in two negative COVID-19 tests in a 24-hour period. If Parsons is unvaccinated, he would be required to miss five days before he can return, making him unavailable for Saturday's contest."Parsons Says He's The Most Versatile Defender In The NFLParsons was on the verge of making history by breaking the record for most sacks as a rookie. He could also take down T.J. Watt as the frontrunner for Defensive Player of the Year, something that's not likely to happen if he misses Week 18.Even so, he's still pretty sure that he's the best defender in the league:"I take complete pride in being the most versatile player in the NFL," Parsons said, as quoted by USA Today. "I think I would put myself up there with the elite guys around the league in terms of impacting the game. It definitely hasn’t been a one-man job. The DBs help me a lot being able to hold the receivers so that way I can get the pressure and sacks and things like that. (But) I think I do a lot of very different things on the defense that change the game."The Cowboys Have A Lot To ProveThe Cowboys enter this game with one of the best records in the NFC.Nonetheless, some people still doubt their ability to respond when it matters the most, especially considering how much the offense has struggled in the second half of the season.They've failed to deliver against winning teams and some think that record is kind of misleading.Needless to say, Parsons has played a huge part in the Cowboys' success thus far and their top priority should be to get him back at full strength for the playoffs.