Free agent TE Kevin Boss (concussions) hasn't been medically-cleared to play. Boss, 29, has suffered at least four serious concussions since entering the league in 2007, and his latest one came in Week 2 last season. Once a promising red-zone threat with the Giants, Boss' career has gone off the tracks.

The Chiefs listed TE Kevin Boss' release with a failed physical designation.

Chiefs released TE Kevin Boss. Signed to a three-year, $9 million deal early in free agency last year, Boss suffered a season-ending concussion in Week 2. He finished with just three catches. Boss has a long and winding concussion history, suffering no fewer than four during his NFL career. The former Giant and Raider could be at the end of the line after failing to gain medical clearance last season.

Chiefs TE Kevin Boss (concussion) is out for the season. Doctors told Boss that they wouldn't be able to clear him at any point this season. It's not a surprise for a player with at least four serious concussions on his resume. Boss' first season in Kansas City ends with a 3/65/1 line in three games. He's due $2.4 million in base salary in 2013.

Chiefs declared TE Kevin Boss, NT Anthony Toribio, FS Kendrick Lewis, WR Devon Wylie, CB Jacques Reeves, QB Ricky Stanzi and TE Jake O'Connell inactive for Week 3 versus the Saints. Boss has a history of concussion and appeared to have sustained one in Week 2. Steve Maneri will fill in as the second tight end alongside Tony Moeaki. The Chiefs defense has struggled without Toribio and Lewis the first two games.

Kevin Boss (head) has been ruled out for Week 3 against the Saints. Boss was injured in Week 2 against the Bills after S Da'Norris Searcy laid a wicked forearm to the front of the Boss' helmet while he was making a 29-yard catch. Boss has five catches for 91 yards in the season's first two weeks. Tony Moeaki will handle tight end duties. He is not a fantasy option.

The Chiefs confirmed that TE Kevin Boss sustained a head injury during the Week 2 loss to the Bills. Boss took a wicked shot from Bills S Da'Norris Searcy and did not return. Searcy was penalized for unnecessary roughness. Boss has a history of concussions, leaving his Week 3 status very uncertain.

Kevin Boss left Sunday's Week 2 game against the Bills with an apparent head injury. Boss caught a 29-yard pass deep down the middle and took an elbow to the head while falling to the ground from Bills safety Da'Norris Searcy. He walked off the field under his own power but looks questionable to return. Searcy was penalized on the play.

Kevin Boss had four catches for 62 yards in the first half of the Chiefs' second preseason game.

Chiefs agreed to terms with TE Kevin Boss on a three-year, $9 million contract. After watching Bill Belichick and Josh McDaniels embrace the two-tight end attack, new Chiefs coordinator Brian Daboll, formerly a Patriots assistant, will install one of his own. Boss will be the inline tight end with Tony Moeaki (ACL surgery) ticketed for the more versatile "Joker" role. From a fantasy standpoint, Moeaki has the higher ceiling, though neither player is likely to exceed TE2 production.