It was thought the Spaniard was pushing for more than a one-year contract extension at Enstone, bringing rumours of Aston Martin into the equation, whilst the Silverstone squad was thought to want an experienced team-mate for Lance Stroll.
Alonso has now got his wish and is confirmed in a multi-year tenure at the team.
“I have known Lawrence and Lance for many years and it is very obvious that they have the ambition and passion to succeed in Formula 1,” he said.
“I have watched as the team has systematically attracted great people with winning pedigrees, and I have become aware of the huge commitment to new facilities and resources at Silverstone.
“No one in Formula 1 today is demonstrating a greater vision and absolute commitment to winning, and that makes it a really exciting opportunity for me.”
“I have known and admired Fernando for many years and it has always been clear that he is a committed winner like me,” added team owner Lawrence Stroll.
“It seemed natural therefore to invite Fernando to be part of the development of a winning team, and we very quickly established in our recent conversations that we have the same ambitions and values, and it was logical and easy to confirm our desire to work together.”