​Manchester United manager Jose Mourinho has suggested he is happy for English football to adopt the VAR system, but only if the on-field referee makes the final decision whether to use the technology or not.

Mourinho's side ​were involved in fresh controversy during their 2-0 FA Cup fifth round win over ​Huddersfield, after VAR official Neil Swarbrick overruled the linesman's decision to award a goal to Spanish midfielder Juan Mata.

The United ace's effort was subsequently ruled out for offside after the use of inconclusive pictures, though Mourinho offered a pensive response in regards to technology's impact on the game after the final whistle.

Huddersfield Town v Manchester United - The Emirates FA Cup Fifth Round

"It's an experimental period,'' Mourinho told BT Sport, via ​ESPN. "They have to get rid of the bad and make it perfect.

"It should be the referee's decision. Why? Because the referee wants to perform well. I don't think they're happy to make mistakes and if they have the VAR to help them make the right decision, I think the referees are probably happy with that.

"But if the VAR changes their good decisions for bad decisions, I think they're not happy with that. It was a bit frustrating because the moment I saw [referee] Kevin Friend touch his earpiece, I knew something was going to happen.

Controversy aside, the Red Devils boss was pleased with his side's performance, as they booked their place in the FA Cup Quarter-Finals for the eighth time in 11 seasons.

"We knew that it would be difficult" Mourinho told ​BBC's Match of the Day. "It was hard but we started really well. With that second goal in the second half I think we killed the game and from that moment we were in control.

"Good counter-attacks, twice attacking the space well. Twice cold in front of the keeper, good decisions, good shots, good goals, important goals from us."