Arsenal boss Arsene Wenger has slammed the standard of refereeing in this season's Champions League.

Wenger has long advocated the use of televisual aids and believes UEFA must end their resistance to it after a controversial week in Europe's top competition.

"I think this year it has been very poor, honestly, throughout the competition," said Wenger. "You analyse all the teams in the Champions League semi-finals, how they got through, there are many, many decisions that have been wrong. I don't know why."

Wenger wants the use of technology to be expanded so it covers other key decisions, such as offside.

"It is good news the Premier League have introduced it and I hope there is more good news to come on technology because we want the right decisions to be taken," said Wenger. "The more assistance the referees get, the better it is.

"When you look at the level of refereeing that you have seen again in Europe this week, it's absolutely disastrous what happened.

"When you have four players that are offside and nobody sees it, how can that happen? In the same action, another player is offside and scores a goal, and we stand here and defend that? It's not defendable. Just because we do not want to progress and move forward. It's absolutely not acceptable."