I think selection for International Friendlies must have been easier having the most recent entire ISL season performance of players handy.
It was great to see all the ISL teams opt for Indian goalkeepers which is the first time in all of ISL seasons so far. 
Taking a look at the performance of the Goalkeepers based on the below ISL end of league stage data, I would go with the following goalkeepers as my choice:
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Arindam Bhattacharya: Outstanding saves (50), least goals conceded (15 in 20GP), highest number of clean sheets (10) and best M/G (120)
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Amrinder Singh: Overall good record on all fronts (S, GC,CS, and M/G)
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TP Rehenesh: Overall good record on all fronts (S, GC,CS, and M/G)
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Gurpreet Singh Sandhu: 4th Choice - Overall good record & 57 caps representing national team
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Vishal Kaith: Overall good record on all fronts (S, GC,CS, and M/G)
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Laxmikant Kattimani and Dheeraj Singh: If we normalize their games played then, these 2 also performed well during this season.
@Shubhayan Why Albino? Albino had the highest number of goals conceded this ISL season - 36 
Clean sheets (3) were average - not impressive comparatively unless you are factoring the team defensive performances.
Secondly, why are there only 3 Forwards in the squad? No additional forwards as back ups - Bipin Singh? 
Lastly, I am wondering why the no.1 goalkeeper this ISL season, Arindam Bhattacharya, has not been included in the national squad announced!?