Matt Slater of BBC Sport warned that a possible Brexit could lead to British football being 'radically changed'.
Given this morning's outcome of the referendum, his fears could become reality.
His research unearthed that more than 400 players could lose the right to play in the UK, while others say it may give home talent a chance.
"Leaving the EU will have a much bigger effect on football than people think," said football agent Rachel Anderson.
"We're talking about half of the Premier League needing work permits.
"The short-term impact would be huge but you could argue it will help in the long term as it could force clubs to concentrate on home-grown talent."
Post-Brexit, the UK could lower freedom-of-movement restrictions on the rest of the world which would "broaden the talent pool, not reduce it," according to Leave Campaigner Brian Monteith.
For the Premier League at least, the league believes it is almost impossible to know what the situation regarding overseas players would be post-Brexit. It is a stance shared by the Football Association.
The full article, including more opinions from experts, can be read here (link).