Speaking after the result that, barring something remarkable from teams below, has secured the Welsh side's top-flight status, Monk said: "He came in shouting 'goal of the season' - typical Jonjo.
"He's got that in the locker. It was a fantastic finish and the thing that pleased me most about it was that it was an important goal at an important time of the match, and those are the things that can change games for you and it did."
Monk believes Shelvey is the type of player who could one day be considered by England.
"People have been talking about his potential for years but you forget he's only 21," Monk added. "If it's not now, it should be later if he carries on progressing as he should be.
"For all the players I think that's the ultimate ambition. If they continue to work hard and play like that I'm sure a few of them, hopefully, will get noticed."