Manchester United defender Luke Shaw admits Manchester City's Treble success was tough to watch.

United could've prevented the Treble, but lost to City in the FA Cup final.

"It hurt a lot. A lot," said Shaw.

"All of us as players felt that, especially for me, seeing them come to the England camp. It was really hard to take. We can't let that happen again.

"It's our time now to start putting a stamp on things and not letting it always be so easy for them because, in the past, it's looked like that.

"As players, we can't accept that any more."