Forward Ben Marshall becomes the second Connacht player this season to end his career because of concussion.
Connacht miss out on a first European Champions Cup quarter-final after a dramatic 19-10 defeat by Toulouse.
Ospreys climb to the top of the Pro12 with a convincing bonus-point win over reigning champions Connacht.
Connacht lock Ultan Dillane could miss the early part of Ireland's Six Nations campaign because of an ankle injury.
Audio & Video
Highlights as Pro12 champions Connacht beat Newport Gwent Dragons in Galway.
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What's on BBC Sport this week
This week's sport on the BBC includes the FA Cup fifth round, Welsh Open snooker and the World Alpine Skiing Championships.