Shelvey has said he should never have left Liverpool.
Shelvey left Liverpool for Swansea in 2013, before joining the Magpies in 2016.
“I had the option to stay but I felt I had to go away as I was at that age where I wanted to play football matches."
Shelvey, 27, added: “You'd get a game one week, big players would come back and you'd be out of the team next week. I came away from Liverpool and kinda had regrets."