The sight of Mayra Ramírez bulldozing her way through the Old Trafford penalty area to power Chelsea to a symbolic 6-0 victory that clinched last season’s title may still be raw in the minds of many Manchester United supporters.

Six days after United had won their first major trophy, proudly lifting the Women’s FA Cup at Wembley, they were brought crashing to earth with a humbling defeat that exposed some of their defensive frailties and highlighted the chasm between them and the champions, as they finished fifth and Chelsea won a fifth title in a row.

As the teams prepare to meet again on Sunday, United are again fifth and Chelsea top but defending has been Marc Skinner’s team’s strength this season. They have let in two goals in all competitions after nine games and kept seven clean sheets. Their unbeaten start is under threat like never before, though, as they travel to face a side who have a 100% record since Sonia Bompastor took charge in the summer.

Skinner expects his team to use May’s chastening defeat as extra fire in their bellies, hinting that their pride was dented that day. “That’s a fuel and motivation, that game,” he said. “They had absolutely everything to fight for on that last game of the season to win the title, and maybe we dipped below our hunger levels in that game. We’d just won the FA Cup and we were finishing where we were going to finish in the league, and it’s a big wake-up call for us.

“The reality is, when we walked off that field, nobody felt good. You can have a choice, can’t you? You can [have] fear from it, or you can do something about it. I think these players have now learnt from that. It’s not about blame, it’s about growth. We have to learn and grow from that game.

“We’ve got to be concentrated, be physically present, mentally present for every one of these minutes. And if we can do that to the best of our ability then we can win the game.”

United have never beaten Chelsea in the Women’s Super League, although they did defeat them in the FA Cup semi-finals in April. When Skinner was asked whether Sunday’s game was a must-win for his side’s title aspirations, he said he believed there was no harder opposition in Europe: “To say it’s a must-win against a team who have not lost a game and who have played the way they have, I think it’s just a bit overreaching. It’s a ‘want to win’, for sure. But this is the hardest task in probably Europe right now. We know what we’re going to face.

“We’re going to go into it very positively. There’s confidence. We’re going to give absolutely everything. It’s winning your duels. It’s the real foundations of the game, rather than these tactical strategies. Sometimes you have to go: ‘How do we maximise those one-to-ones?’ And if we can do that then we stand a chance in the game of taking the points.”

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Chelsea have won eight of their nine WSL meetings with Manchester United, drawing one and scoring a formidable average of three goals a game. Bompastor, the first manager to win their first seven WSL matches, is facing United for the first time and said: “We expect a tough game, because they are unbeaten in the league as well. They defend really well. They have some strengths, they have some weaknesses.

“The [Chelsea] players at the moment are confident but not full of confidence, because they are professionals. They know there are high expectations. Of course we are in a good run and in a good dynamic but we haven’t won anything yet – that’s the reality.”