Marc Skinner says Manchester City's opening goal, which should have been ruled out for offside, proved pivotal in changing the momentum following their 3-1 defeat to rivals Manchester United on Saturday afternoon.
United stifled City early on in the Women's Super League contest, creating the better of the chances and forcing the title chasers into their best opportunities coming from long distance strikes.
But United were made to rue their missed chances as City found their opener and luck was on their side as Khadija Shaw was seen to be in an offside position in the build-up to Jess Park's first goal.
Skinner was left frustrated with the goal not being ruled out, believing it was a key moment that impacted his side after a positive start to the game.
"When I look back at the first goal, it is offside, said Manchester United boss Marc Skinner to BBC Radio 5 live.
"All of a sudden they get a corner and they get momentum at home. It is not a goal [Jess Park's opening goal] and it shouldn't have stood.
"We had chances before that which we would have taken on another day, we were making Khiara Keating work way more than what Mary Earps is having to work.
"When I watch it back it is disappointing losing a game as big as this.
"What can you say? It is a massive game, to miss that call in a game like this it changes the momentum and in football momentum is key.
"We controlled Man City, we had more shots of quality than they did, but they got a goal and momentum changed.
"But I can only say I am proud of the players and the way they reacted - I am proud of them."
Under the watchful eye of England manager Sarina Wiegman, in attendance at the Etihad, Park starred with two goals and an assist to her name to help City claim an emphatic victory
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