Prithvi Shaw and Suryakumar Yadav cleared to fly to England directly from Sri Lanka.
The teams had also faced off earlier in the year when Sri Lanka played two Tests in South Africa.
A severely depleted India line-up hobbled to an inadequate 81 for 8 in their 20 overs.
Sri Lanka hold nerve to sink depleted India in low-scoring thriller, a weakened India line-up only managed 132.
Hasan Ali and debutant Mohammad Wasim impress for Pakistan with the ball.
The 3-match ODI series is scheduled to start from 1 September 2021 in Sri Lanka.
After keeper-batsman Mushfiqur Rahim and opener Tamim Iqbal, batsman Liton Das has been ruled out of the upcoming T20I series against Australia.
WI flounder with the bat again; Ashton Agar was impressive on his return while Mitchell Starc claimed another three wickets
India beat Sri Lanka by 38 runs in the first T20 International at R.Premadasa Stadium, Colombo on Sunday.
Soumya Sarkar returned figures of 2/19 with the ball before scoring a career-best 68 as Bangladesh beat Zimbabwe by five wickets and took the T20I series 2-1.
