Sharjeel, a left-handed opener from Hyderabad whose last appearance for Pakistan was in August 2014, has got the selectors thinking with a blistering 117 runs off 62 balls in the Pakistan Super League eliminator against favourites Peshawar Zalmi.
Sharjeel, who has played 11 ODIs and three T20I internationals, savaged the Peshawar attack led by national T20 captain Shahid Afridi to guide Islamabad United to a surprise spot in the final.
"The day belongs to Sharjeel and he will get his reward," Afridi said.
Fast bowler Sami has also been in top form for Islamabad, taking 5/8 in the playoffs against Karachi Kings.
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A source close to the selectors said batsman Khalid Latif could also be placed on stand-bye for the two tournaments.
Chief selector Haroon Rasheed and Afridi have said that since the ICC has allowed teams in the main round of the World T20 to make changes within the March 8 deadline, there could be changes based on performances of players in the Asia Cup being held in Bangladesh from February 24.
The selectors had dropped the seasoned Ahmed Shehzad for the two tournaments and instead recalled Test opener Khurrum Manzoor who didn't feature in the PSL since no franchise picked him for the event.
Rasheed is presently in Dubai for the PSL and the source said that the selectors had spoken to Afridi and head coach Waqar Younis who is in Lahore and were trying to decide when to announce the changes.
More signficantly, this was Cook's first century in 20
But Amir then took the shine off an excellent session for England by bowling Cook following an under-edge from a ball that kept low.
That became the last delivery before tea, with England 210 for two at the interval.
James Vince, looking for a maiden Test fifty to cement his place in the side, fell in all too familiar fashion when, on 18, he chased a wide Rahat delivery outside off stump, with his edged drive caught low down by wicket-keeper Sarfraz Ahmed.
What made his dismissal all the worse wast that Vince had been dropped by Younis Khan in the slips off a similar shot when on six off Amir.
Gary Ballance (23) then helped Yorkshire team-mate Root add on 73 before he chopped on against Rahat.
England have not lost a home Test batting first since 2012, a sequence encompassing 10 wins and two draws.