Greenock star Berrington will join the country’s ton-up club as the Scots look to end their season with a win at Bothwell Castle Policies in Lanarkshire.
And the 25 year-old, who scored a century at the top of the order in last month’s T20 win over Bangladesh, could be asked to play the same role in the longer format.
Coach Pete Steindl must find a new opening partner for Calum MacLeod after on-loan Josh Davey returned to Middlesex.
Berrington is one of several candidates, along with Ryan Flannigan, Ewan Chalmers and South African Jean Symes.
Meanwhile, skipper Gordon Drummond is determined to end a difficult campaign on a high.
The Saltires have managed just one win – in a rain-affected clash with Notts back in May.
They have since lost six in a row with three games rained-off, but Drummond said: “We’re determined to finish with a win. It has been a difficult campaign and the weather has prevented us getting into our rhythm. But we know what we are capable of and want to thank our supporters for their backing this season by putting on a really strong performance.”
Arbroath all-rounder Calvin Burnett has been drafted into the squad.
Squad: G Drummond (capt), C MacLeod, R Flannigan, J Symes, R Berrington, E Chalmers, P Mommsen, M Haq, C Wallace, G Goudie, A Evans, S Sharif, C Burnett.