Maro Itoje has the humility to stay grounded - Graham Rowntree

British and Irish Lions assistant coach Graham Rowntree said England international Maro Itoje has the "humility" to stay grounded despite his impressive performance in the recently concluded second Test in Wellington.

Itoje was included in the starting line-up replacing George Kruis for the Westpac Stadium clash and produced a fine performance as Lions went on to win the game 21-24.

The thousands of raucous Lions supporters chanted the name of Itoje to the tune of the White Stripes' Seven Nation Army and Rowntree is confident that the success and fame won't affect the Saracens lock.

"Maro's biggest quality is humility and how humble he is and how he is continually striving to get better," said Rowntree.

"He was calling the lineout on Saturday. He is still a young man.

"It's a pivotal Test and he is in there calling the lineout on top of everything else he is doing in the game."

Lions capitalising on a red card to Sonny Bill Williams managed to edge out New Zealand with a three point victory which means the series is still level at 1-1 with both the teams locking horns on Saturday for the decider in Auckland, which is also a fortress of All Blacks.

Ahead of the game in Wellington, Itoje described leading the Lions' lineout for the second Test as just "business as usual" and Rowntree is confident that the 22-year-old will reach greater heights in his career.

"You can't deny his game impact, his physicality. I thought he brought all that," Rowntree said.

"And I like his composure. He is continually striving to get better, asking everyone, 'How can I get better?' He will go a long way."