The ICC Event Technical Committee has agreed to changes to be made to the Ireland, Afghanistan and Canada teams
Wilson has been in prolific form for both county and country in 2012, and his experience will bolster the team for the crucial encounter with the defending champions Afghanistan.
Ireland currently top the table with 54 points from three games, with Afghanistan having 37 points.
Meanwhile, the technical committee also approved a change in the Afghanistan side. Najieebullah Zadran will replace Shabir Ahmed Noori.
Canada's replacements for the Pepsi ICC WCL Championship matches against Scotland have also been approved. Darren Ramsammy, Zahid Hussain and Manninder Aulakh will come in for Henry Osinde, Parth Desai and Rizwan Cheema.
The Irish squad in full is as follows:
Kevin O'Brien (capt) (Somerset)
John Anderson (Merrion)
Andrew Balbirnie (Pembroke)
Alex Cusack (Clontarf)
Trent Johnston (YMCA)
Rory McCann (Instonians)
John Mooney (North County)
Paul Stirling (Middlesex)
Max Sorensen (The Hills)
Stuart Thompson (Limavady)
Albert Van der Merwe (YMCA)
Andrew White (Instonians)
Gary Wilson (Surrey)
Ben Wylie (Instonians)