Manchester City manager Pep Guardiola has revealed he spoke with Jurgen Klopp after the five substitution rule.
City and Liverpool played out an entertaining 1-1 draw at the Etihad on Sunday.
And both coaches have conceded that the amount of substitutions should be increased due to a congested fixture schedule.
Asked by BBC Sport's Match of the Daywhat he and his Liverpool counterpart discussed after the final whistle, Guardiola replied: "We talked about five substitutions. If people want to give microphones so we can give our opinions... English player, right-back is injured.
"There are many guys with many, many cases. Around the world five subs are key, but here it's totally the opposite. We've talked about this many times."
He added to Sky Sports: "Trent Alexander-Arnold, international English player, now injured.
"Here we believe we are more special, we don't protect the players, so that is why it is a disaster.
"This calendar came from a year before and I will demand for players to come back otherwise it will be difficult to maintain it."
