In just seven games this term the Spain international has scored once – the winner in a victory against Arsenal – and has claimed four assists. He has also helped the Blues keep four clean sheets in those matches.
Though most fans were predictably supportive of their No.3, many did temper their assessments, and stopped short of calling him the standout in his position in the top flight.
For many, his defensive flaws were holding him back, even despite his attacking qualities.
But were they wrong? Has Alonso blossomed into the Premier League’s best full-back or is he still on a journey to the top?
We put it to the numbers to find out. Let us know your thoughts by tweeting us at @FB_Whispers.