INDIANAPOLIS -- Colts quarterback Anthony Richardson has an AC joint injury and will miss an undetermined amount of time, coach Shane Steichen said Monday.
Richardson sustained the right shoulder injury in Sunday's victory over the Tennessee Titans when he was tackled from behind by outside linebacker Harold Landry III, leaving him unable to move his right arm.
The Colts, Steichen said, are still conducting medical evaluations and a final timeline has not been established. But Richardson won't play in the Week 6 road game against the Jaguars, the coach said.
"He will miss some time," Steichen said. "How much time? I don't know that right now and that's all I've got on that situation."
Asked whether a stint on injured reserve is possible -- sidelining Richardson for at least four games -- Steichen didn't rule it out, saying, "We're still evaluating all that stuff."
There was initial fear that Richardson sustained a Grade 3 sprain to the AC joint, sources told ESPN. But the team was seeking additional medical opinions, including one from orthopedic specialist Dr. Keith Meister, according to sources.
The Colts are 3-2 and tied for the lead in the AFC South with Jacksonville heading into Sunday's matchup. Gardner Minshew, a 2019 Jaguars draft pick, will start the rematch of the Week 1 contest Jacksonville won 31-21. Minshew entered Sunday's game against Tennessee and completed 11 of 14 attempts for 155 yards in two-plus quarters.
Sunday marked the third time Richardson has had an injury situation this season. The 2023 fourth overall pick was pulled from the season opener after taking a hit to a knee, then missed Indianapolis' Week 3 contest against the Ravens after suffering a concussion against the Texans in the previous game.
"It gets tough when a guy gets dinged up, and he's been dinged up," Steichen said. "He's obviously a very, very talented player and it's tough. But we have a lot of faith in Gardner to step in and go operate the way he's been doing."
Regarding any potential frustration from Richardson, Steichen said the rookie is coping with the setback.
"When you have an injury, it is obviously tough on everybody," Steichen said, "but he's fighting through it."