Premier League clubs will still be able to sell players to other leagues until their respective windows close, but no internal deals will be allowed.
Deadline Day as we know it is about to drastically change from next summer. This could lead to clubs from the likes of La Liga, Bundesliga, Ligue 1 and more still being able to come in, unsettle and even sign players.
English Premier League (EPL) clubs on Thursday voted to close the summer transfer window the day before the start of the season, a new system that is to be enacted from next campaign.
"In my view, it is not good when footballers play for one club when the league starts and another club when the transfer window closes".
Changing this aspect of the summer window has been a hot-topic for some time, with many managers unhappy with transfer business continuing three weeks into the new Premier League season, often causing rifts between players and clubs. It will only affect Premier League clubs signing players - they can still sell players to other leagues.
"If we do it in the Premier League and the rest of Europe don't do this, still we have a problem", said Koeman.
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Whilst the agreement offers a significant number of long-term benefits, these are restricted exclusively to Premier League clubs without affecting the rest of Europe, hence creating a situation in which European super-clubs can benefit.
Unconfirmed reports say today's ruling was not unanimous but that the change received the required two-thirds majority of 14 clubs.
The new date applies only to clubs in the Premier League and relates only to purchasing of players.
While this is seen as a big step forward when it comes to having a squad set in stone before the start of the season, there are still issues.
Similarly, the transfer windows in other English competitions such as the Championship, League One and League Two will be unaffected. Get the app and get the game.
"The answer is I think is very obvious", he said.