This agreement was reached at the annual general meeting of clubs on Thursday, where there was a presentation by Professional Game Match Officials Limited [PGMOL] referees’ chief Mike Riley.
The PGMOL is hoping the change will give advantage to the attacking team, following a VAR feedback from Premier League clubs last season.
It is however not confirmed if the thicker lines for offside will be used for FA Cup ties next season.
Football lawmakers, the International Football Association Board [IFAB], do not specify a maximum thickness of lines, under the laws of the game.
FIFA, which has operational control of VAR, trialled semi-automated offside technology at the Club World Cup in 2019 in Qatar.