Luton Town captain Tom Lockyer was forced off early on in the Championship play-off final in scenes that worried fans.
The centre-back has been in fine form for the Hatters, playing 45 times in their stunning campaign in the second tier.
But the former Bristol Rovers man lasted just 12 minutes against Coventry City at Wembley having gone down unchallenged.
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Lockyer, wearing the No.4 on his back, appeared to fall to the floor with nobody near him and then as he attempted to get up, sunk into the turf and lay motionless.
Sky Sports cameras panned away to the crow. There was immediate concern for Lockyer and he received medical attention before being stretchered off and replaced by Reece Burke.
In an update from Sky Sports reporter David Craig, it was communicated that the Wales international was conscious in the medical room.
Reports claimed that his parents were with him and he then made his way to a nearby hospital. Details on the incident are still unknown, with the game quickly resuming at the national stadium.
Luton went 1-0 up in the 23rd minute through Jordan Clark after lovely play from Elijah Adebayo, with Rob Edwards' side well-placed to achieve a historic promotion to the Premier League.
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The Bedfordshire outfit were a Conference side in 2009 after a spell in administration and a points deduction for financial issues but returned to the Football League in 2015.
After getting to the play-off semi-final under Nathan Jones last season, they finished third in the Championship this time around and knocked off Sunderland over two legs.
A win will bring huge financial rewards for Luton, who have one of the most unique away ends in football at Kenilworth Road.
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The club's chief executive has already admitted that huge, costly improvements will have to be made to their 10,000 capacity ground should they achieve promotion.
Topics: Wembley Stadium, EFL Championship, Premier League