When the Premier League spends more than £1billion in a single transfer window, it's difficult to determine which signings will prove good value for money.

On one end of the spectrum you have free acquisitions like Zlatan Ibrahimovic, surely one of the bargains of the summer in spite of his wages. On the other, you have world-record arrival Paul Pogba, who the vast majority expect to turn out as a worthwhile investment over the course of the next five to ten years.

But it's those in between FootballFanCast are paying specific attention to - those like Victor Wanyama, a well-established Premier League midfielder whom Tottenham Hotspur poached from Southampton for just £12million due to his contract situation.

The Kenyan enforcer has enjoyed a fantastic start to his Spurs career, so with his modest price-tag in mind, here are three stats that prove he's the Premier League's signing of the summer.

Spurs haven't lost a game with him in the starting XI

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The Lilywhites have lost just one fixture across all competitions so far this season - a 2-1 defeat to Monaco at Wembley in the Champions League - and curiously enough, that was just one of two fixtures in which Wanyama didn't feature, the other being a 5-0 drubbing of third-tier outfit Gillingham in the League Cup.

Their record with the midfielder in the starting XI, on the other hand, is near-on perfect, winning six and drawing two.

Most tackles of any Spurs player

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Much of Tottenham's success this season has been founded upon a phenomenal defensive record, boasting the healthiest goals conceded column and the most clean sheets of any Premier League side.

Wanyama has been a fundamental influence, completing the most tackles of any Spurs player and the ninth-most of any player throughout the division. That includes six tackles during Spurs' 2-0 win over Manchester City, in which the 25-year-old played a crucial role.

Interestingly, Idrissa Gueye and Oriol Romeu are the only other out-and-out defensive midfielders on the above list, suggesting Wanyama is currently one of the top-performing enforcers in the Premier League.

Transfer record vs League position

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A curious calculation courtesy of our mates at Transfermarkt.com, in which they compare the ranking of Premier League clubs' net spend during the summer against their current league position. As you can see, second-placed Spurs are +5 ahead of their position in the net spend table, meaning only five Premier League clubs have got more value for money out of their summer signings.

However, you may also notice Spurs' net spend is -£29.24million, by far the biggest deficit until we get into Manchester City and Arsenal territory. Of course, that's not all down to Wanyama. But considering he was the Lilywhites' second-cheapest signing of the summer after George-Kevin N'Koudou, not to mention his performances on the pitch, he's had a monumental impact on the north Londoners outperforming their summer expenditure by five places.