Leyton Orient will this week monitor the condition of goalkeeper Jamie Jones after he was knocked out during Saturday's 1-0 defeat by Colchester.
Jones had to be stretchered off and taken to hospital after he lost consciousness following a first-minute collision with team-mate Ben Chorley.
"He was knocked unconscious but we are hopeful everything is okay," said manager Geraint Williams. "He's come round and everything seems fine, but obviously you have to be careful with these things and we'll keep an eye on him."
Glenn Morris is on standby to replace Jones against Brentford next weekend.
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