Philadelphia Stars' quarterback Bryan Scott announced on his Twitter that he is leaving the team and heading home to rehab following a significant knee injury. Bryan Scott Injury UpdateScott, who was the No. 3 overall pick in the USFL expansion draft, left Sunday's loss to the Generals after appearing to suffer the injury after planting with his right leg while evading a pass-rusher in the second quarter.Based on initial video, ProFootballDoc, Dr. David Chao, believes that the 26-year-old gunslinger likely suffered a torn ACL. He will undergo surgery and miss the remainder of the season, but will be able to make a full return in 2023.Neither Scott nor the Stars have confirmed the nature or severity of the injury. The quarterback is also reportedly dealing with an ankle injury on top of the potential torn ACL.Scott went down almost immediately after the move grabbing at the lower part of his right knee. He was able to walk off the field and into the medical tent but was seen with tears in his eyes in the second half.Coming into the game, Scott was emerging as one of the early stars in USFL's comeback season. The Occidental College product led the league with 474 yards and four touchdowns on 70.8% completion. When he went down last Sunday, Scott was 9-13 for 84 yards, nearly half coming on a 41-yard TD pass to tight end Bug Howard.The Stars, 1-2, will turn to Case Cookus, who will have a whole week to prepare before his first start Friday night against the Michigan Panthers.Cookus, a 12th-round pick, went 13-20 with 146 yards and one touchdown in relief of Scott. The 6'4 right-hander threw for 12,057 yards and 105 touchdowns in 41 starts at FCS Northern Arizona, but had two seasons cut short due to shoulder injuries. The Stars have yet to fill their final available quarterback spot on the roster, although they will have until Friday to do so.USFL OddsThe Philaldephia Stars are +800 to win the USFL, according to FanDuel Sportsbook.