This summer, with Ashley Cole departing and left-back obviously a position Chelsea needed to invest in, for many people the obvious choice was Luke Shaw.
The Southampton left-back had just had an exceptional season in the Premier League and beaten Cole to selection for the World Cup in Brazil - so obviously teams were looking into his availability.
Plus Chelsea had another advantage over potential suitors - Shaw is a lifelong Chelsea fan. Who grew up going to watch The Blues in action at Stamford Bridge - but the deal never came off.
Instead Manchester United signed him for a fee in the region of £30 million. Chelsea signed Felipe Luis for about half that and Mourinho said signing Shaw for the amount United are paying him would have 'killed' the Chelsea dressing room.
But it does not change the fact that when Manchester United face Chelsea in the Premier League this weekend Shaw will be going up against his boyhood club.
But that will not be an issue.
According to quotes posted by the official club website Shaw seems up for the game:
"I'm really looking forward to it, especially with how big this fixture is. Everyone knows that Manchester United-Chelsea games are massive, so it's something I'm really looking forward to."
"It's a huge game – I think you can safely say it's one of the biggest games in world football and there will be people everywhere watching it on TV. There aren't many games that are bigger than this one and that's why I'm really hoping to be a part of it. I want to show people what I can do in games like this."
Shaw put in two incredible performances against Chelsea for Southampton last season and Manchester United fans will hope that he is similarly fired up for this fixture in a United shirt.