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Chadli opened the scoring against Rangers with a neatly lifted finish following a lovely piece of chest control. He scored his second goal with a powerful header from close range.
Both showed the kind of predatory instincts that Chadli exhibited at FC Twente. He also produced a sensational pass to spring Danny Rose for Emmanuel Adebayor's goal in the second half.
Chadli's ability to act as an additional centre-forward is part of his appeal as a player, but he has struggled to show his quality.
If he can build on this performance, Chadli is the ideal man to partner with Erik Lamela and Christian Eriksen in Spurs' attacking line. With pace and significant physical presence, he offers the dual role of winger and auxiliary striker.
He has been the first player mentioned by media and Spurs fans alike when discussing the "mistakes" of last summer's transfer window. Most fans would suggest he was the most likely to be sold and least likely to be missed of all the new acquisitions.
After enduring a largely anonymous first season, Chadli rather struggled at the World Cup with Belgium, but his performance against QPR suggests he will flourish under Mauricio Pochettino.
Mark Bryans of the London Evening Standard quoted Pochettino as saying:
Lamela, Adebayor, Chadli and Eriksen create the movement and rotate - they are free.
We work a lot on the training ground but it is important that the players are free in their minds because they are creative players.
You can not put the players like that in the shade, you need to provide the organisation but after that they are free.