Sanchez looks to Sonner
He already has seven caps but wasn't a part of former Northern Ireland boss Sammy McIllroy's plans.
Sonner has made 20 appearances for The Reds so far this season since his summer free transfer from Walsall.
Darren Ward and Gareth Taylor have also both been called-up by Wales manager Mark Hughes. They play Scotland at the Millennium Stadium on the same date.