Billy Vunipola admits he's been "rubbish" for England lately, but insists he's ready to prove his worth to Eddie Jones with a strong performance against Wales.
Vunipola has so far been unable to make his mark as the all-conquering number eight he's been famed for in the past, and has put his loss of form down to being a "coward" due to fatigue.
"I've just been playing rubbish, I can't lie. I need to turn up this weekend and that's what I'm planning on doing," Vunipola said.
"It's about helping me motivate myself to help the team. And to help the team I need to be the player that I know I can be.
"I know I haven't been that player and it's annoying me more than anyone else. I'm ready for Wales. I haven't been myself and I need to go out there and show what I can do.
"There have been a lot of questions asked about my place within the team. That's not always a bad thing because sometimes it can make or break a player and I want to show that I'm worth my place within the squad.
"I just haven't played well at all. And I could play a hundred more games at the level I am playing at now and I'd still be rubbish, so it's not about playing yourself into form.
"At the moment, I guess because of my lack of game time, I am trying to put myself in positions where I don't have to run as much, so that I still get the ball and have the same effect.
"There's a great NFL coach (Vince Lombardi) who said that fatigue makes a coward out of everyone and I guess I've been a bit of a coward in the last two weeks because I've been hiding from being fatigued."
