Former Cherry Orchard schoolboy Mark has been in the Ireland set-up since Under-15 level.
He played in the SSE Airtricity U17 League with Shamrock Rovers before joining AFC Bournemouth in 2016.
A tall commanding goalkeeper, he played U18 and U19 football for Ireland in the 2016-17 season. He was first called up to the Ireland senior squad in March 2019.
Mark made his senior debut in the home friendly win over Bulgaria in September 2019 and next played in the 3-1 friendly win over New Zealand.
He made his competitive debut in the 3-2 defeat against Serbia in Belgrade in the FIFA World Cup qualification campaign.