The spinning duo were uncapped at the start of the trip and held modest first-class records.
But Hartley is the series' leading wicket-taker with 20 dismissals in four Tests and Bashir got a maiden professional five-for in Ranchi.
Lancashire signing Australia star Nathan Lyon this summer places a question mark over how much game time Hartley, 24, will get, while Bashir is second choice at Somerset to Jack Leach.
McCullum admitted Lancashire and Somerset have their own interests to consider, but England's head coach hopes Hartley and Bashir (below), 20, will not fade away.
"We've got to keep trying to get cricket into them," McCullum said.
Denne historien er fra February 28, 2024-utgaven av Daily Mirror UK.
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Denne historien er fra February 28, 2024-utgaven av Daily Mirror UK.
Start din 7-dagers gratis prøveperiode på Magzter GOLD for å få tilgang til tusenvis av utvalgte premiumhistorier og 9000+ magasiner og aviser.
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