The 19-year-old was given his first taste of Premier League football since August and he took the opportunity with both hands, posting a mature performance against Harry Winks in midfield.
He came in for widespread praise from West Brom fans on Twitter after enhancing his reputation against a side who had beaten Real Madrid and Borussia Dortmund in recent weeks.
It was a brave choice by Megson to bring him back, but one that ultimately paid dividends, and the 58-year-old is confident that the teenager can look forward to a glittering career in the game.
"In terms of Sam, I think he's going to have a great future as a footballer. He's got a lot of qualities," he told The Express and Star.
"We've had some players not playing well enough to keep their place week in week out."
Megson won't be retained as a permanent manager and it'll be interesting to see if Tony Pulis's long-term successor - whoever that may be - continues to use Field.
Pulis had given him a brief taste of the big time with a couple of Premier League games early in the season but he hadn't been anywhere to be seen for a while.
But surely impressing against Tottenham at Wembley has done wonders for his hopes of being kept in the thick of things by whoever replaces Pulis.