Maurizio Sarri and Mauricio Pochettino both criticised the use of a video assistant referee in Tuesday's EFL Cup clash between Tottenham and Chelsea.
Spurs came away from the first leg of their semi-final with a 1-0 lead to take to Stamford Bridge later this month thanks to a VAR-assisted Harry Kane penalty; the spot-kick given after an offside decision in the build-up to Kepa’s foul on the striker was overturned and the England captain converted.
VAR is set to be introduced in the Premier League next season and has been trialled in the domestic cups since last season.
Sarri saw the technology at work in Serie A with Napoli last year and claimed Premier League officials are not ready to handle the "disaster" of VAR.
"In Italy there is the VAR. In the first period it was a disaster, also in Italy it was very difficult for the referee to get used to the system,” the Italian said.
“I think that at the moment here the referees are not ready to use in the right way the system. For example, apart from the image in our camera, Kane was offside, clearly offside, but it is not important.
"I think it is more important that the linesman stopped running, he didn’t follow the ball, so for the players on the pitch it is clearly offside so I think he had a big influence on our defenders.
"I think that they need to study better the system. It is very strange in the Premier League there is not the system, but in the Carabao Cup suddenly there is the system.
"Of course it is very strange for us, for the players, but also for the referees."
Tottenham endured a perplexing evening with VAR in the FA Cup last season as they beat Rochdale, after which Danny Rose branded the technology “complete nonsense”, and from his manager’s perspective things have not improved.
“To be honest, I am not happy with that system,” Pochettino said.
“It is a system that we still need to be agreed in the way we are going to use it. I think a good example is La Liga, no one is happy because no one knows the clear way we are going to use. Everyone is complaining in Spain from day one and I hope that now we have time to develop that system, we need to work a lot, we need to agree between of course players, coaching staff and referee. It needs to be a tool to improve the game.”
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He added: “People may say ‘this guy is crazy’ but I tell you and I get the benefit [of the decision], if I am in the wrong way when it doesn’t benefit us, it is easy to complain but today I need to be clear and honest and I am not happy all too much.
“Some percentage of the referee’s mistakes we need to keep but the decision we cannot stop evolution but how we can help is agreeing with the referees, players and between all the football people how we are going to use, that is most important.”