After a crazy Deadline Day for the player, Sissoko finally penned a five-year-contract to sign for the North London club late into Wednesday evening, having been desperate to leave Newcastle for a Premier League side all summer.
Spurs hijack Everton in final hours
For weeks now, no club had been willing to satisfy Newcastle's valuation of Sissoko, but like London buses, two came along at once as the clock ticked into the final hours.
It was fellow Premier League side Everton who played their hand first, having a bid accepted and getting everything set up for a medical as Sissoko settled for a move to Goodison Park.
However, with just over an hour of the window left, Tottenham chairman Daniel Levy matched Everton's bid, Sissoko doing a u-turn as he decided to sign for Tottenham ahead of Everton, leaving the Merseyside club astounded.
Pochettino's summer spending finishes
He signed the contract and got the medical done quickly enough for the relevant documentation to be sent through in time, meaning that Sissoko becomes Mauricio Pochettino's fifth and final first team signing of the summer.
He joins Vincent Janssen, Victor Wanyama, Georges-Kevin Nkoudou and Pau Lopez as new signings, with the latter two having also joined just hours earlier on Deadline Day.
Many have suggested that the £30million fee is far too high for a player of Sissoko's skill level, so he'll now be determined to prove the doubters wrong and be a success at White Hart Lane. Whether or not he'll start straight away remains to be seen, but he's likely to be in the squad for their next game, away at Stoke City a week on Saturday.