Eden Hazard celebrates after scoring Chelsea's second goal in the win over Arsenal
There were a lot of raised eyebrows when Antonio Conte splashed out £23 million in the summer to sign Alonso, but he has certainly lived up to his price tag.
The former Bolton man has been on fire for Conte's new-look side and continued in the same vein today after bullying Hector Bellerin to score his fourth goal of the season.
He's proving to be an important cog in the Chelsea machine.
Marcos Alonso continues to impress for Chelsea
The diminutive Frenchman continues to impress for Chelsea in the heart of their midfield.
He pulled the strings against Arsenal and kept the likes of Alexis Sanchez and Theo Walcott at bay.
A real trooper who looks set to win the Premier League title again this season.
A changed man from last season.
The playmaker is rejuvenated under Conte and he showed why he was named the 2014/15 PFA Player of the Season today by waltzing past the Gunners' defence with relative ease to slot home and ensure the Blues went 12 points clear at the top.
Antonio Conte's 3-4-3 system continues to work wonders
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Conte celebrates with Chelsea fans after Hazard scores sensational goal against Arsenal
Sat, February 4, 2017
Antonio Conte was very pleased with Eden Hazard's goal against Arsenal!
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Antonio Conte's 3-4-3 system is working wonders
Conte has struck the perfect balance within his attack and defence.
The Blues suffered a 3-0 defeat to the Gunners at the Emirates in September, but are a completely different side now.
David Luiz, Gary Cahill and Cesar Azpilicueta combined with the versatile capabilities of full-backs Alonso and Victor Moses have been key to the Blues' success at the back.
Revenge is sweet for Conte.
Put the icing on the cake for Conte's side.
He's not had much of a look in at the Stamford Bridge this season, but netted against his former side after Petr Cech's howler.