A majority of top-flight clubs are pushing for the summer window to shut before the start of the season and will vote on the proposal next month.
They are pushing for a new deadline to prevent the disruption caused by managers buying players when the season is already under way.
But the change would not stop foreign clubs from swooping for Premier League players, raising the prospect of domestic clubs being left in the lurch.
Watford are understood to be among those clubs who oppose a change in the rules, which will be voted on at a meeting in London on September 7.
But it emerged yesterday that the Football League could follow suit and adopt a summer window that shuts before the start of their season.
Alexandre Lacazette (Lyon to Arsenal)
“It will be important that all the consequences of such a decision are fully considered”
Football League spokesman
That too would cause problems as Football League clubs typically kick off their campaign a week earlier than their top-flight counterparts.
But a Football League spokesman said: “We will be tabling the matter for discussion with clubs in September.
“It will be important that all the consequences of such a decision are fully considered, as the requirements of our clubs are different to those in Europe’s top flight leagues.”
This year’s window shuts on August 31, 20 days after the start of the Premier League season and 27 after the first EFL clashes.