Dolphins CB Jalen Ramsey to have knee surgery, sources say

Jalen Ramsey hurt during Dolphins practice, requires surgery (1:04)

Marcel Louis-Jacques reports on Dolphins CB Jalen Ramsey hurting his knee during practice on Thursday. (1:04)

MIAMI -- Dolphins star cornerback Jalen Ramsey will undergo surgery on the meniscus in his left knee and is expected to miss the start of the regular season, league sources told ESPN's Adam Schefter.

Ramsey's ACL is intact, the sources said.

It wasn't immediately known exactly how long Ramsey will be sidelined, but one source told Schefter he could miss "a few months," depending on how the surgery goes.

Ramsey posted on social media that he'll "be back on that field stronger than ever."

Ramsey left Thursday's practice early after colliding with wide receiver Tyreek Hill and was carted back to the locker room afterward.

The three-time All-Pro participated in 11-on-11 drills in the team's third day of training camp but appeared to get tangled up with Hill while in coverage. Both players fell to the ground, and Ramsey sat upright for a few seconds before standing to his feet. He attempted to walk off the injury before leaving the field under his own power.

Team athletic trainers tended to his left knee for the remainder of practice, and Ramsey was carted back to the locker room at the conclusion of practice.

The Dolphins traded a third-round pick and tight end Hunter Long for Ramsey this offseason, pairing him with another All-Pro in cornerback Xavien Howard. Coach Mike McDaniel is expected to comment on Ramsey's status when he speaks to the media Friday morning.