Davis, captain of Michael O’Neill’s side, has been included for matches against Wales and Slovenia.
Northern Ireland, who have qualified for their first major tournament in 30 years, will warm up for EURO 2016 with a game against Wales on Thursday 24th March, with a kick-off time of 7.45pm GMT.
O’Neill’s side will then welcome Slovenia to Windsor Park for their final friendly before the end of the season. That game takes place on Monday 28th March, kicking off at 7.45pm BST.
Davis will then return to the south coast to link back up with Saints ahead of the trip to Leicester City on Sunday 3rd April.