This week he will represent the Irish U21s but Southgate has not yet given up hope of persuading the 19-year-old to switch nations.
He said: "Jack is somebody we have spoken to over the years, him and his family. He has been in our younger development teams. The family and Jack are aware of our interest.
"Up to this point they have preferred to remain with Ireland.
"Lots of other home nations are running development camps at a young age so players develop an allegiance quite young.
"You are allowed to switch once you are a young player and Jack is someone we are monitoring and we'll keep our eye on that situation."
Southgate added: "We have been monitoring him but in the end it's up to the player.
"He's going to make his decision on where he wants to go. More and more, because of the nature of society, there are players in our system who are duel nationality and have that choice to make."
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