Cork has been discharged from hospital his loan club Burnley have confirmed.
Due to illness the player was substituted at half-time in last night's England Under 21 match versus Iceland, held at Preston's Deepdale Stadium.
Burnley today (Tuesday) report the following on their official website:
"Jack Cork has been discharged from hospital after undergoing tests.
"The on-loan Clarets' midfielder stayed in hospital in Preston overnight after feeling unwell during the game.
"The 21-year-old was replaced and left the ground at half time with England under-21 coach Stuart Pearce confirming afterwards that he had been taken to hospital as a precautionary measure after suffering from 'palpitations.'
"Cork will continue to be assessed by club medical staff before returning to training at Turf Moor."