Mauricio Pochettino's influence is one of the main reasons why Victor Wanyama has developed into the player he is today - that is the view of the midfielder's older brother, McDonald Mariga.
Wanyama has been quietly impressive alongside some of the headline-grabbing attacking stars in the Spurs line up this season such as Harry Kane, Dele Alli and Christian Eriksen.
The Kenyan is only in his first season with the London club having joined from Southampton last summer for a bargain £11m, but has the look of a player who has been there a lot longer, and according to his brother McDonald - a footballer for Serie B side Latina - that's thanks to Pochettino.
He told ESPN FC, as quoted by the Evening Standard: "I think he got stronger when he started to play at Celtic. He became more muscular - the football in Scotland, England is more physical.
"But he said Pochettino is the coach who has made him. He's the one who, when Victor came to Southampton, he taught him what to do and how to play - all the things. He's the one who taught him everything and made even more qualities for Victor.
"He gave him exposure and confidence. If you don't have confidence from the coach, you cannot perform well. He's helped him a lot."
Wanyama has been a mainstay alongside Mousa Dembele in the centre of the park, playing in every league game bar the two recent 4-0 wins over Swansea and Watford because of injury.
The 25-year-old former Celtic man is aiming to reclaim his place in the starting line up for the FA Cup semi-final crunch clash against Chelsea at Wembley on Saturday.