Premier League and English Football League clubs will no longer be able to sign players from the European Union without a valid work permit unless they surpass a threshold based on the quality of the selling club and the player's seniority.

The EPL and EFL announced the measures in a joint statement Tuesday, clarifying for the first time the effects of Brexit on English football. The United Kingdom is officially separating from the EU on Dec. 31.

The new rules will be in effect starting January 2021.