UEFA introduces four substitutes, unveils new rules
UEFA announce drastic new Champions League rule changes ahead of next season – including fourth substitution.
They will allow players to compete for two different clubs in the same European cup competition from next season.
The governing body have also revealed a fourth substitute will be allowed in extra time of knockout ties and that 12 substitutes can be named in the finals.
Most Champions League group games will now kick off at 8pm, though each group-phase round will have four earlier matches played at 5.55pm UK time.
As it stands, January signings are not permitted to play for a second club in the Champions League or Europa League if they have already featured in that competition. It means Arsenal have not been allowed to field former Borussia Dortmund striker Pierre-Emerick Aubameyang in their run to the Europa League quarter-finals.