The young midfielder entered the action as a 75th-minute substitute alongside Spurs team-mate Adam Smith at Wycombe's Adams Park. Danny Rose started to make it three Spurs caps on the night.
Typically, Tom looked to get on the ball throughout his cameo appearance and kept possession ticking over against a Romanian team generally camped in their own half as England dominated.
He combined well with Adam to set-up a chance soon after coming on - Adam just failing to pick out Nathan Delfouneso with his cutback - and rifled a volley in on goal that Laurentiu Branescu did well to hold onto.
In the end, goals from Wilfried Zaha, Jack Robinson and Delfouneso saw the Young Lions home for an eighth-successive win.
"It was a proud moment to get some game time and I'm delighted to win my first cap for the Under-21s," Tom told us afterwards.
"I just wanted to get on the ball as much as possible and try to impress the manager.
"The week has gone really well so far, training has been great and I'm really happy to end the first half of the international break with some minutes on the pitch."
Tom, Danny, Adam and Andros Townsend now switch Wycombe for Brighton and a friendly against Austria on Tuesday.
It's the final action for the Under-21s before Stuart Pearce selects his squad for this summer's European U21 Championship Finals in Israel.
"The aim is to try to keep impressing this week and hopefully play some more minutes against Austria," added Tom, who was also capped at Under-19 level. "After that, I'll return to Spurs and hopefully do well enough for the rest of the season to book a seat on the plane to Israel."