Jose Mourinho has joined Spurs ahead of a critical juncture in the season.
Daniel Levy's decision to replace Mauricio Pochettino with the former Manchester United boss is seen by many as a big gamble, with the two coaches' styles differing vastly.
At Spurs, Pochettino has been seen to nurture young talent and improve the players he already had in his squad - but it's not something that is said often of the former Chelsea manager.
Since taking over at Stamford Bridge in 2004, Mourinho has been one of the top managers in the world, adding to the Champions League he picked up at Porto with Inter Milan, while winning domestic titles in England, Italy and Spain.
Mourinho has picked up a reputation for needing vast amounts of money in the transfer window to shape a squad to his liking - and when a team cannot or refuses to back him, it has not turned out so well.
Would he accept a run of two transfer windows in a row with no players added to the squad as Pochettino had to? It seems unlikely.
With the January window fast approaching, what changes could Mourinho make to the Spurs first team? And do his past dealings offer a hint as to what we can expect from the 'Special One'?
In his first spell at Chelsea, Mourinho only made two January signings. Midfielder Jiri Jarosik came in for just under £11m in January 2005, with the Blues already well on their way to winning the Premier League title.
However, after just six months Michael Essien arrived at Stamford Bridge, and Jarosik was out the door and on a year-long loan to Birmingham City. Jarosik left permanently the following season, joining Celtic.
The only other January deal at Chelsea was a 16-year-old centre-back called Slobodan Rajkovic, who failed to make an appearance for the club, becoming one of the infamous loan army and leaving permanently for Hamburg.
At Inter, Mourinho only made one signing in the January window - defensive midfielder McDonald Mariga. The Kenyan initially joined on a co-ownership deal, with his permanent move completed in the summer after Mourinho's exit.
In his three years at Real Madrid, Mourinho surprisingly made just two January signings. In 2011, Emmanuel Adebayor joined on a six-month loan deal from Manchester City, scoring twice against Spurs in the Champions League before picking up a Copa del Rey winners' medal at the end of the season.
And in 2013, the goalkeeper Diego Lopez joined for a small fee after Iker Casillas suffered an injured hand. Lopez would go on to keep his place as No.1 keeper for the entire season as a power struggle between Casillas and Mourinho raged on.
That summer Mourinho left Madrid, moving back to Chelsea. He made three big signings in his first January transfer window: Nemanja Matic, Mohamed Salah and Kurt Zouma, at a combined cost of over £50million.
The season did not finish as well as Mourinho may have hoped, but the impact of Matic really came the following season as he set up a powerful combination in midfield alongside Cesc Fabregas, with Chelsea winning the Premier League and League Cup.
By that stage, Mohamed Salah had already left on loan, though he did pick up a Premier League winners' medal. He left for Fiorentina on loan in the winter window in 2015, with Juan Cuadrado coming in to replace him at a cost of around £28million.
Mourinho was sacked by Chelsea in December 2015, meaning no January window that season.
His move to Manchester United in 2016 added just one name to the list of his winter transfer window signings, when Alexis Sanchez swapped Arsenal for Old Trafford in 2018.
Going in the opposite direction was Henrikh Mkhitaryan - a move that seemed to suit all parties with Sanchez's contract expiring the following summer.
But both players moved out on loan this summer after just 18 months at their new clubs.
Mourinho's search for instant impact is plain to see in his January dealings, with only two players you could describe as not ready for the first team.
Every other player has been expected to hit the ground running, and if they do not then they are replaced. It is a costly method, with Chelsea in particular spending over £40million on wingers in just 12 months - and neither of them hanging around for long.
Whether Spurs and Daniel Levy are prepared to offer him the same level of backing in the market remains to be seen.
