Forwards coach Graham Rowntree has heaped praise on rookie prop Mako Vunipola, who was named in England's squad for the November internationals on Thursday.
The 130kg, 21-year-old Saracens loosehead, son of former Tonga international Fe'ao Vunipola, has been fast-tracked in to the England squad having made just four Premiership starts for Saracens and one in the Heineken Cup.
But Rowntree felt Vunipola's form was simply too good to ignore as England looked for a replacement for Alex Corbisiero, who is still recovering from a knee injury.
"I have no doubt he will make his name in this autumn series. I have got every confidence in him," Rowntree said.
"I am looking for a fault in his game and I can't find one at the moment.
"He has got himself fit, very fit. His form has been exceptional.
"I like his commitment to every aspect of the game. He is a dynamic ball-carrier and he loves a scrum and you know that turns me on!
"He respects all the hard yards, the tackling, the clearing out, the scrummaging. He has got his priorities right."
"Mako brings something different to the party," added assistant coach Andy Farrell, who coached Vunipola at Saracens.
"He turned professional 18 months ago when he came to Saracens and that took its toll on his body straight away.
"It is not easy, especially as a front-row forward, to cope with the demands of the Premiership but he has got his body in such a condition now that he is playing exceptionally well.
"His form this year has been down to a change of attitude. He has grown up a lot over the last six months.
"He has got stuck into his living outside of rugby, his fitness, his training is second to none."
Vunipola was born in Wellington, New Zealand but relocated to Wales when his father - who won 32 caps for Tonga signed for Pontypool in 1998. He qualifies for Wales but has always always aimed to play for England, having worn the rose at U18 and U20 level.