Chad Marshall (Seattle Sounders) attempts to win the ball from Giles Barnes (Houston Dynamo)
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UPDATE: Seattle's Chad Marshall tweets "Scans went well and I'm doing alright" after leaving training

EDITOR'S NOTE: Marshall took to his twitter account on Wednesday night to reassure friends, family and fans that he's ok:

Seattle Sounders defender Chad Marshall left Wednesday’s training session in an ambulance after falling and hitting his head during a drill, Sounders head coach Sigi Schmid confirmed to Seattle Times reporter Matt Pentz and other media. 

The Sounders called their training session off early following Marshall’s injury. Schmid spoke to media after he ended practice, and acknowledged that Marshall’s injury is head and neck related. has reached out to the Sounders for further information, and will update if the club issues any official comment.

Marshall, last year's Defender of the Year and the only three-time winner of that award, has 27 regular season appearances in 2015 for Seattle, who lost fellow center back Ramon Torres for the season due to an ACL tear earlier this month. The Sounders host the LA Galaxy on Sunday.