ST. JOSEPH, Mo. — Cyrus Allen — the Kansas City Chiefs rookie receiver who’d been the standout of early camp — left Saturday’s practice with a lower-leg injury after colliding with teammate Kaiir Elam on a special teams drill.Allen, a fifth-round pick out of Cincinnati, was serving as gunner on a punting drill when he made contact with Elam. Allen remained down for about a minute, then needed help off the field while struggling to put weight on his left leg.Chiefs' Cyrus Allen injured after collisionJesse NewellAfter that, Allen was checked by trainers in the medical tent, then went up the practice hill while riding in the front of a cart. The Chiefs reported Saturday that Allen had a “lower leg” injury and was receiving further evaluation.“I hate to see somebody get hurt, especially on a special teams drill,” Chiefs special teams coordinator Dave Toub said. “We’ll see how he is.”Allen emerged as the star of camp the previous two days, with offensive highlights that included a one-handed grab from quarterback Patrick Mahomes that went viral across social media.“He’s really doing well on offense, and he’s doing well for me (on special teams) too,” Toub said. “He’s at gunner. He’s at returner. He’s doing a real good job. He’s putting himself in a good position to be a guy that’s going to help us this year.”All that, however, is if Allen is able to avoid major injury. Coach Andy Reid will speak to reporters for a potential update following Monday’s practice after an off day.Allen’s recent emergence had some fans wondering Saturday why Allen was working special teams drills at all, given his potential impact at receiver this season.Toub explained Saturday that the Chiefs start all their rookies on special teams before pulling them back if they eventually become focal players on offense or defense. He noted that No. 6 overall pick Mansoor Delane would be working with special teams if not for a shoulder injury, while future Hall of Fame tight end Travis Kelce also began his first season working as a special teamer.