Bangladesh's opening pair has proven their most vulnerable link in recent times across formats and the curious case is set to continue with the Tigers set to field the fifth different opening pair in seven Tests this year when they meet Pakistan in the second game of their two-match Test series in Mirpur today.

The latest episode of the muddled modus operandi was a maiden call-up for opener Naim Sheikh for the second Test, which follows a comprehensive eight-wicket defeat in Chattogram for the hosts.

The left-hander attended his first nets session for the Test team at the outer nets in Mirpur yesterday but looked shaky from the start and frustrated batting coach Ashwell Prince. The left-hander was recalled by Prince midway through the batting session after trying to play an upper cut to a short delivery from Rejaur Rahman Raja.

Chief selector Minhajul Abedin earlier opined that Naim, who played his last first-class cricket match three years back, was picked for his 'international experience'.

The decision also seems harsh on Naim, who was called suddenly and with hardly any preparation, and it seemed obvious the left-hander would endure a tough time adjusting to the demands of Test cricket.

All eyes will again be on the opening slots, but the question that remains is who will open the innings alongside Shadman Islam after opener Saif Hasan -- who had a terrible time with the bat in the first Test -- was diagnosed with typhoid.

Following the rather disappointing nets session, a lack of confidence in Naim may again put the think-tank in a dilemma.

Mahmudul Hasan Joy, another young top-order batsman who also got a maiden Test call-up, is among the contenders to replace Saif, but it was learned that left-handed Najmul Hossain Shanto may open the innings alongside Shadman for the second Test.

Najmul, who was dismissed for a duck in the second innings of the first Test, showed promise during a brief stay in the first innings when he made 14. The 23-year-old has been in good touch in the longest format, usually coming in at number three, and has scored two centuries in his last four Tests.

But it will be a mammoth challenge against a top-quality Pakistan pace bowling attack, which feature the likes of Shaheen Afridi and Hasan Ali -- who both claimed five-wicket hauls in Chattogram.