Tottenham stars Alderweireld and Vertonghen rarely play alongside one another with Belgium.
“It clicked with Toby at Spurs,” Vertonghen said. “[However] it is important that we look for the best defense, and not the best case for me and Toby. Maybe I play central, but I feel best at left. A few years ago, the coach let me know that I am the first choice in that position [left-back], and not in the centre. I have already completed 40 to 50 international games at left back.”
Vertonghen has established himself at Spurs as first-choice central defender, although he retains many of the traits associated with a full-back in the central position.
He often sprints up the pitch to the support the attacking players, whilst being fast enough to track back and cover in the back-line.
Vertonghen has taken up the central role with Alderweireld at White Hart Lane, following his move to Spurs this summer.
He is a much more defensive minded player, although he also shows some attacking traits, owing to the fact that he can also play as a right-sided full-back.
It is these full-back positions that Vertonghen and Alderweireld play for Belgium, and it is at left-back that Vertonghen - and Belgium head coach Marc Wilmots - believes is his best position.
Despite this, it could be that the Spurs duo line up alongside one another in the centre of defence for Belgium this week, when they take on Andorra and Israel.
First choice centre-back Nicolas Lombaerts is currently injured, and rather than trusting Jason Denayer with a new parter, Wilmots could look towards the Tottenham pair - especially considering their great form this season.
Spurs have conceded just four goals this season in eight Premier League games, and this defensive solidity could prove to be vital for Belgium as they look to secure their qualification for Euro 2016 during this international break.