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The middle-order batsman has had a stellar season and cemented his spot at No5 in New Zealand's test line-up.
Coming off his fifth test century on Monday, he may now get the chance to prove himself higher up the order.
Kane Williamson remains doubtful for the third and final test against Bangladesh, beginning on Saturday in Christchurch. The captain is not joining the squad until later this week as he looks to recover from a pectoral injury.
If he does not play, Will Young will get a long-awaited opportunity.
Who will bat at three remains a question, although Nicholls was comfortable about moving up the order if required.
''I'm not too worried. If that's the opportunity and what the team needs, that's great.
''But we know we've got Will Young there. He's a very good player for Central Districts and earned his place in the squad.
''He's been batting three for them, so whatever way they go, I'll be comfortable with.''
Nicholls' century helped the Black Caps win the test and the series, despite losing two days to rain. It was his third test ton of the summer.
''It's nice to be contributing, and contributing a bit more consistently,'' he said.
''I guess that's the challenge moving forward ...''
It has been another quality summer for New Zealand's batsmen.
Tom Latham and Jeet Raval have become a very solid opening pairing, while Williamson and Ross Taylor continue their dominance.
Taylor's swift 200 set the platform for the win in Wellington.
''... for Ross to score a double hundred on a bowler-friendly pitch at nearly a run a ball, it was pretty cool to bat with him for a period of time,'' Nicholls said.
''Again we're expecting conditions to be a little bit different [at Hagley Oval].
''What that test wicket's like will be interesting, so it's just another exciting opportunity to keep pushing forward.''
-In-form Wellington Firebirds wicket-keeper Tom Blundell has been called into the New Zealand squad as cover for the third test.
Blundell, who scored a test century on debut against the West Indies last season, is joining the squad in Christchurch as back-up for keeper BJ Watling, who strained his hamstring on Tuesday before play on the final day of the second test.