Alonso was confirmed as Calum McFarlane's replacement shortly after Chelsea's FA Cup final defeat against Manchester City.
The 44-year-old has signed a four-year contract at Stamford Bridge, returning to management for the first time since being sacked by Real Madrid in January.
BlueCo deserve huge praise for persuading arguably the best manager on the market to join, and ahead of an official announcement later today, Alonso has confirmed the news on X.
Sharing an article from Spanish outlet Marca on the news of his imminent arrival in West London, Alonso wrote: "Xabi Alonso, close to becoming Chelsea manager."
It's an incredible coup for a team who could be playing next season without European football, and supporters can finally praise the board for getting a decision right.