The Royals announced that they have placed third baseman Mike Moustakas on the 15-day disabled list with a tear in his right anterior cruciate ligament (ACL) and have called up outfielder Brett Eibner from AAA Omaha. Moustakas injured himself in a collision with outfielder Alex Gordon on a foul pop up in Sunday's game against Chicago. Gordon was placed on the disabled list earlier this week. Moustakas finished the game on Sunday, but missed all three games since then. Moustakas was hitting .240/.301/.500 with 7 HR 13 RBI in 27 games. He has already served a stint on the disabled list this year for an injured thumb.

The ACL is one of the ligaments in the knee and is crucial for pivoting and planting the leg. An ACL tear to Cubs outfielder Kyle Schwarber ended his 2016 season. The Royals have not given a timetable for Moustakas but it is probably safe to say he will miss a significant amount of time, and his entire season could be in jeopardy.

The Royals promote outfielder Brett Eibner to make his Major League debut. The 27-year old right-hander was hitting .309/.411/.537 with 10 HR 28 RBI in 41 games for AAA Omaha.

Update at 4:01 p.m.: Mike Moustakas is out for the season.