Rugby legend Sir John Kirwan believes Sam Whitelock could extend his Test career into his late thirties after reports of a possible return to New Zealand. All Blacks head coach Scott Robertson is discussing Whitelock's comeback ahead of the July Tests. New Zealand is facing a shortage of experienced locks after the departures of Retallick and Whitelock. Kirwan and ex-coach Laurie Mains support Whitelock's return, citing the importance of winning between World Cups. Although there is debate about Whitelock's potential longevity, both Kirwan and fellow former player Jeff Wilson agree on his value to the team.