Nicholls has played 45 games since joining the club as a 17-year-old access selection in 2010, while Leslie has played six games, after being recruited with pick No.20 in the 2013 National Draft.
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“I believe we have the best group of boys, and the best city to play footy in, so I couldn’t see myself going anywhere else in 2017,” Nicholls said.
“The coaches and the leadership group have been awesome in terms of culture and giving the guys a license to lead.”
Leslie also said he is delighted to have re-signed with the Suns.
“I couldn’t be happier to be continuing my AFL career in Queensland and I can’t wait to get back into it,” Leslie.
“The off-season provides everyone the opportunity to refresh and recharge, but our sights are firmly fixed on continuing to build confidence and momentum when we return for pre-season training.”