Arsenal midfielder Jack Wilshere has backed in-form team-mate Aaron Ramsey to improve on his impressive start to the season.
The Welshman has begun the new campaign with eight goals in nine appearances in all competitions.
Ramsey once again caught the eye in Saturday's 2-1 victory over Swansea City at the Liberty stadium, providing the assist for Serge Gnabry's first professional goal before netting the second.
And Wilshere was full of praise for his midfield partner, warning rivals that the 22-year-old will get better for Arsene Wenger's side.
"If he carries on playing the way he is and working hard, he can improve further," Wilshere said.
"He's got a great appetite for the game and he wants to improve all the time. He's fit, he's young and he's showing his best form. Hopefully he can continue it and get even better.
"His fitness levels are not normal. He's naturally so fit he can score at any time in the game.
"He's pushing on in the 94th minute trying to get another. Not many players can do that.
"Hopefully he can keep his run going. The great thing is that he's got his confidence back."
The victory over Swansea leaves Arsenal leading the Premier League, but Wilshere admitted that there can be no let-up in their pursuit of the title.
He added: "It's nice to look at the table and be top, but we know it's only a good start. We've got to keep it going.
"There's an international break coming up soon when we won't play for a fortnight and we want to be top then."