The 26-year-old quickly established himself as one of the best 'keepers in the Premier League, impressing fans and experts alike with his commanding presence and agility between the sticks. They were also reluctant to let me move to a club that was playing in the Champions League that season.
And in a desperate bid to replace Courtois, CFC had to massively over-spend on bringing in 'keeper Kepa Arrizabalaga from Athletic Bilbao for as much as €44.7m more than his true market value. "Obviously they don't know all the truth", he told reporters after Belgium's friendly win over Scotland on Friday.
"Then because the transfer was close I didn't show up [to training] because I thought it was better not to disturb the squad".
Chelsea are not the only English club that overpaid in their summer dealings, with Everton's move for Yerry Mina, Danny Ings' switch from Liverpool to Southampton and Bournemouth's deal for Jefferson Lerma among the top-10 over-inflated deals.
"If I did go there maybe, I didn't want to be toxic, so obviously it is a pity because I love Chelsea". "Hopefully it will turn around".
'When I arrived here my plan was to stay here as long as possible and now I am here for five years I hope to stay five more. "I had a chance to go back to Spain to be closer to my kids".
"I know that a lot of Chelsea fans will understand my decision".