Tottenham manager Mauricio Pochettino has admitted that he didn't like the use of
After the win, Pochettino insisted he is 'pro-technology' but joined his opposite number in criticising the implementation of VAR, warning that English football is in danger of following La Liga where 'no-one is happy' with the current system.
"I don't like, I don't like," he told Sky Sports (via Goal) . "Today we get the benefit but watching another league like La Liga, no one is happy.
"For me the benefit is nice, but I am not happy doing it like this.
"I am pro-technology, you cannot stop evolution. I think it is not clear how we use the rules. The photos we use, we have to be clear how we use them."
Pochettino cited the example of Spain's La Liga as a warning to English football and called on the powers that be to improve the system before its use in the Premier League next season.
He said: "I am watching La Liga every week and no one is happy – the big clubs or the small clubs. That is a good example for us.
"We still have six months to improve that system."
Spurs travel to Stamford Bridge for the second leg on 24 January, knowing a draw will be enough to see them progress to the first domestic cup final of the 2018/19 season.