One of the biggest mysteries of the summer transfer window – and there have been a few – is the persistent rumour that Chelsea are looking for a left wing-back, to relegate Marcos Alonso. Danny Rose, of Tottenham, has been mentioned.
Yet Alonso has been a vital performer for Chelsea since arriving less than a year ago, as the 2016 transfer window closed. He defends reasonably well, he gets forward impressively – most of all, he scores important goals.
In Chelsea's title winning season he chipped in with the first two in a 3-0 win at Leicester, the opener in a 3-1 win against Arsenal, the second in the 5-0 rout of Everton that was perhaps Chelsea's stand-out display of the campaign.
Marcos Alonso celebrates after a firing a late winner underneath the body of Tottenham goalkeeper Hugo Lloris
Michy Batshuayi heads beyond the outstretched glove of Thibaut Courtois and into the back of his own net
Marcos Alonso watches his free-kick nestle into the back of the net and beyond the reach of Tottenham's Hugo Lloris
Hugo Lloris' despairing dive isn't enough to prevent Alonso from putting Chelsea ahead against Tottenham
Marcos Alonso wheels away after giving Chelsea the lead with a magnificent free-kick in the 24th minute of the game
The Chelsea players embrace the Spanish left-back after his sweetly struck free-kick flew into the top corner
Marcos Alonso gives Chelsea the lead with a stunning free-kick. CLICK HERE for more from MATCH ZONE
Tottenham Hotspur: Lloris, Dier (Son 68), Alderweireld, Vertonghen, Trippier, Wanyama, Dembele, Davies (Sissoko 80), Alli, Eriksen, Kane
Subs not used: Janssen, Vorm, Wimmer, Winks, Walker-Peters
Booked: Dier, Vertonghen
Chelsea: Courtois, Azpilicueta, Christensen, Rudiger, Moses, Kante, Luiz, Alonso, Willian (Pedro 78), Bakayoko, Morata (Batshuayi 78)
Subs not used: Caballero, Kenedy, Musonda, Tomori, Scott
Goalscorers: Alonso 24
Booked: Rudiger, Luiz
Referee: Anthony Taylor
Here, he took the wind out of Tottenham's sails midway through the first-half, silencing a home crowd of more than 70,000.
Much has been made of Tottenham's poor form at their temporary Wembley home, and Chelsea started well. Even so, by the time Alonso struck, Tottenham had forced two reasonable chances – a Harry Kane shot that Thibaut Courtois failed to gather first time, and an effort from Mousa Dembele cutting inside that was clipped over by the goalkeeper's fingertips.
So when Dele Alli fouled David Luiz outside the penalty area – and it was a foul, despite the protestations of Tottenham's fans – it represented a rare opportunity for a patched up Chelsea side to make an impact. Alonso took it, and magnificently.
Most would have expected Luiz to deliver the kick, but it was Alonso, coming in almost square from the right to strike the ball with his left foot, up and over the Tottenham wall, curling out of the reach of Hugo Lloris, despite his best efforts.
It jolted Tottenham into a response and the rest of the half they put Chelsea under immense pressure, but the damage was done, the doubt sown. And it might not have been Chelsea's first, either.
Alvaro Morata found himself with a free header inside the penalty area but could only direct it wide
The Spanish striker realises he should have done better and given the Premier League champions an early lead
Tottenham midfielder Victor Wanyama looks to pinch the ball from Chelsea winger Willian in the early stages
David Luiz and Dele Alli come