Mauricio Pochettino finally got his man after a somewhat protracted transfer saga for an undisclosed fee from Atletico Madrid.
The 26-year-old Belgium defender was on loan at Southampton last season and made 26 Premier League appearances, winning rave reviews.
His form was so good Atletico were believed to be ready to welcome him back into the fold for this season.
But the Saints may yet take legal action as they believed they had an option to buy the centre-back for £6.8m unless Atletico paid £1.5m to buy back that clause.
None of that matters now, though, as he has been officially unveiled as a Spurs player, taking the club's Belgian count up to four.
Tottenham are right back in the transfer mix
While signing a right-back may not seem significant in the grand scheme of things, Alderweireld's capture promises to be the transfer that shows Spurs mean business this summer.
Since joining the club from Southampton, Pochettino has not truly been able to mould his own team.
One way he tried to achieve that last season was to promote youth who he could fit into his desired style of play.
But now Daniel Levy and the Tottenham heirarchy are giving the Argentine their backing to try and bridge the gap between fifth place and those coveted Champions League spots.
Spurs wary of rivals coming up on the rails
Not only that, but Spurs will also be wary that the likes of bitter rivals West Ham - who are making ever louder noises in the transfer market - and Liverpool will be pushing harder than ever too.
The Hammers are also getting the jump on Spurs with their move to the Olympic Stadium coming two years before Tottenham's planned relocation so the heat is on.
The likes of central midfielders Paulinho and Etiene Capoue have departed for China and Watford respectively and winger Andros Townsend is being linked with a move away, by the likes of the Metro, so it has to be expected the midfield will be set for an imminent overhaul.
Emmanuel Adebayor and Roberto Soldado also face uncertain futures in the club's striking department so reinforcements to help Harry Kane up front will also be needed.
With just four weeks until the start of the new season expect Spurs to be flexing their muscles in the transfer market in earnest.