Newcastle manager Tanya Oxtoby says the gap between the Women's Super League and the second tier is "definitely closing".
Her side, currently sitting fourth in the WSL 2, are facing top-tier opposition West Ham in Friday's Women's FA Cup fourth round tie (19:30 GMT).
"When you look at the investment that goes into WSL 2 clubs in and around that top three or four – the squad depth and facilities and everything within that – then the gap is definitely closing," said Oxtoby, who joined Newcastle in November.
"There's still a physical gap, I think, that clubs are aware of. We're working really hard to make sure we're in a position to impact that.
"If clubs like ourselves can continue to develop then the pay-off is really exciting. We'll know on Friday what the gap is."
Oxtoby has vast experience in the competition having won three successive FA Cup trophies while assistant manager at Chelsea.
The former Northern Ireland head coach describes it as a "magical" competition.
"I know how special it can be. It's another opportunity for us to test ourselves against a really good side in a league that we want to be competing in," she added.
"It's also a really good opportunity for us to see where we're at. I want us to be really brave and play our style of football."
