Spence left [Boro](https://www.thenorthernecho.co.uk/sport/football/middlesbrough/?ref=ed_direct) for Tottenham in the summer of 2022 in a deal worth £20m, which included a number of add-ons.
And it's understood one of those payments will be triggered when Spence makes two competitive England starts.
The first came in this month's World Cup qualifying win over Latvia, and considering Spence looks to have impressed Thomas Tuchel, another imminent competitive start for England looks inevitable for the defender.
Spence received his first England call-up in September and made his debut from the bench in the World Cup qualifying win in Serbia.
He then got a second call-up this month and started both games in the most recent get-together. Spence was in the starting XI for the friendly win over Wales at Wembley and then kept his place and made his first competitive start as England thumped Latvia 5-0.
[Boro](http://www.thenorthernecho.co.uk/sport/football/middlesbrough?ref=au) will now no doubt have an eye on the situation when England are next in action next month with World Cup qualifying ties against Serbia and Albania. A start for Spence in either of those games would result in a financial boost for Boro.
And Boro look well placed to further benefit after Spence's big breakthrough for club and country over the course of the last year or so.
The 25-year-old endured a difficult start at Spurs and had to wait more than two years to make his first start for the Premier League club.
But he forced his way into the side under previous boss Ange Postecoglou and has quickly established himself as a regular under Thomas Frank, starting seven of the first nine Premier League games of the season.
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With Spence now playing regularly and Spurs having enjoyed an impressive start to the Premier League season, more add-ons look set to be triggered in the near and distant future.
Spence joined Boro from Fulham's academy in 2018 and made 63 Championship appearances on Teesside. But he was allowed to join Nottingham Forest on loan in the summer of 2021 when former Boro boss Neil Warnock questioned the defender's attitude.
Warnock said at the time: “He could be playing at a top club in England or in non-league in five years, I don't know.”
Spence impressed at Forest and helped Steve Cooper's side win promotion to the Premier League through the play-offs, before leaving Boro for Tottenham in a permanent move that summer.
But Spence admitted his confidence was immediately "shattered" after then-Spurs boss Antonio Conte suggested he didn't want the defender, claiming it was a "club signing".
He was a fringe figure under Conte and his days at Spurs looked numbered as he went out on loan to Rennes, Leeds United and Genoa.
But after finally making his first Premier League start for Spurs in December last year, Spence has kicked on for club and country and Boro are now set to benefit.