rookie quarterback left Sunday's game against the with a right shoulder injury, marking the third time in five weeks the first-round draft pick has been forced to the sidelines.Richardson , the Larry Nance Jr. Jersey Colts announced Monday. more details, saying it's a Grade 3 sprain and that he could mi s at least a month and po sibly longer. Colts head coach Shane Steichen did not offer much on how long Richardson might be sidelined, only sayingthe signal-caller will mi s "some time," .the rookie was diagnosed with Alfonzo McKinnie Jersey a Grade 3 AC joint sprain and could mi s at least a month and po sibly longer. While Steichen did not say how much time Richardson would mi s, IR remains a po sibility.Richardson received an MRI at an imaging center, CBS Sports HQ Senior NFL Insider Josina Anderson. Richardson, who wasn't hospitalized, will seek a second opinion regardle s of the results of his initial scan, per Anderson. IND QB #5 CMP Kevin Porter Jr. Jersey %56.9YDs479TD3INT1YD/Att6.65 Richardson stayed on the ground after falling on his right shoulder while being tackled by Tenne see's in the second quarter. He was then escorted to the locker room for further evaluation, with backup taking over under center.The Colts officially ruled after his exit, then early in the second half.Drafted fourth overall this spring, the Florida product previously sat out Week 3 with a concu sion suffered the week prior. He also briefly left the Colts' Larry Nance Jersey season opener with an apparent lower-leg injury suffered late in Indianapolis' lo s to the . Minshew filled in as the team's starting QB against the , guiding Indy to an upset victory. He helped the Colts carry a tight lead into halftime against the rival Titans on Sunday, while Richardson left Cedi Osman Jersey having gone 9 of 12 for 98 yards through the air.