David Vaughan and Andrew Crofts have withdrawn from the Wales squad for Saturday's friendly against Finland.
Sunderland midfielder Vaughan, who is currently on loan with Championship side Nottingham Forest, has a hamstring injury, while Brighton & Hove Albion's Crofts has picked up a groin injury.
Manager Chris Coleman has reacted to the omissions by handing a call-up to West Ham United midfielder Jack Collison.
Liverpool's 16-year-old Harry Wilson has also been included on the standby list.