KANSAS CITY, Mo. -- Chiefs running back Jamaal Charles was placed on injured reserve Tuesday after developing some swelling in his surgically repaired right knee, leaving Kansas City perilously short of depth at the position.The four-time Pro Bowl running back will miss at least eight weeks, a person familiar with his situation told The Associated Press. That means Charles could return in time for the end of the regular season and the playoffs, assuming Kansas City (5-2) qualifies for the postseason.The person spoke on condition of anonymity because the Chiefs have not announced the move.Spencer Ware has been the primary fill-in for Charles since getting hurt in Week 5 last season, but he sustained a concussion in last Sundays win in Indianapolis. He was still going through the concussion protocol and its unclear whether he will be available against Jacksonville on Sunday.With Charcandrick West the only other running back on the active roster, the Chiefs moved swiftly Tuesday to sign Bishop Sankey. The Chiefs tried out a few running backs before they settled on the former second-round pick, who has been on the Patriots practice squad.The Chiefs also cut linebackers Sam Barrington and Sio Moore on Tuesday.The decision to put Charles on injured reserve was no doubt frustrating for the Chiefs and their career rushing leader. Charles returned to the field for offseason workouts over the summer and was part of training camp, even though the Chiefs took a slow-and-steady approach in his return.Chiefs coach Andy Reid insisted through the first few weeks of the season that he wanted to make sure Charles was healthy before getting on the field. He finally played in Week 4 against Pittsburgh, and again the next two games, totaling 12 carries for 40 yards and a touchdown.But he was inactive last Sunday against Indianapolis, and Reid said after the game that Charles was planning to consult with Dr. James Andrews to decide whether he had experienced a setback.We just cant seem to get that thing to where it needs to be for him to be able to play, Reid said. We are trying to be as cautious as we possibly can with him.Charles tore the ACL in his left knee in 2011, but returned the following season to have one of the best years of his career, appearing in every game and running for 1,509 yards and five touchdowns.Reid said as recently as last week that he hoped to have Charles for the stretch run, though that was before the visit with Andrews and the move to put him on injured reserve.Well need him as we go. Im trying to be as patient as possible -- be smart with it -- is really what Im trying to do, he said. 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Major League Baseball will require teams to start many games earlier than normal beginning in 2018, thanks to a provision in the new labor agreement that goes into effect when either team faces a flight longer than 2? hours after the game.Sources told ESPN that the getaway-day changes will apply if a team has a game -- or even an off day at home -- the next day.The new rules also will prohibit teams from scheduling an early-afternoon game the following day if one of the clubs played a night game in a different city the evening before.The changes were adopted after the players union made scheduling and start times a priority in the labor talks, in an effort to reduce the wear and tear of travel and sleep deprivation.Players have long complained about the number of trips that force teams to arrive at their next destination at 5 a.m. local time or later, allowing for just a few hours of sleep before its time to go to the ballpark.In an interview with ESPN last month, union chief Tony Clark said the new rules were fundamental to the health and performance of players and were negotiated against the backdrop of keeping guys on the field as often as possible.On June 9 of this past season, the Los Angeles Angels played a night game in New York that started at about 7 p.ddddddddddddm. ET. They then played a night game at home the next day. Under the new rules, their getaway-day game in New York would not be allowed to start later than 4:37 p.m. ET.Another example would have affected the much-discussed Aug. 17-18 schedule of the Boston Red Sox, who played a Wednesday night game in Baltimore and then had a Thursday afternoon game in Detroit that started at 1:10 p.m.Under the new rules, the Orioles would not have been required to move up their 7 p.m. start time because the Red Sox did not face a flight of more than 2? hours. However, the Tigers would not have been allowed to start their game the next day earlier than 5 p.m.The agreement allows for certain special exceptions involving holidays and trips to Wrigley Field, where local laws provide less flexibility in scheduling later start times. However, even those exceptions are restricted to instances in which teams face shorter flights. ' ' '