Chelsea boss Frank Lampard believes Premier League referees must start utilising touchline monitors if they are to implement VAR correctly.
The use of VAR has come under increasing scrutiny as the season has progressed, with the latest round of Premier League fixtures throwing up more questions.
Everton's Michael Keane was on Saturday penalised for what appeared to be an accidental collision with Brighton and Hove Albion's Aaron Connolly, as the referee's initial decision not to award a spot-kick was overturned.
There were similar VAR interventions in Manchester United's 3-1 win over Norwich City and Arsenal's draw with Crystal Palace on Sunday.
On-field officials are said to have been instructed to use pitchside screens sparingly, which is a stance Lampard thinks must change.
"Yes, I think it is part of VAR. I assumed when it came into the Premier League that would be the case," he told a news conference ahead of Chelsea's EFL Cup clash with Manchester United.
"I think we are at the point now where from my point of view I think they have to. It is difficult. I am not one to bang the drum.
"It is not easy and even with VAR there is a human element involved because they are the ones that are checking it and it is slightly opinionated.
"I think at the weekend we saw it flip slightly from the other way from what it had been already with some decisions being changed. Hopefully we find the right middle ground as soon as possible.
"I think seeing the monitor on the side of the pitch is the way forward."