More than ever, the transfer window is vital in the Premier League.
If you’re going to win the title, you need to do excellent business off the pitch, or it's unlikely you’ll do it on it.
Last summer, Chelsea wisely purchased Leicester City’s N’Golo Kante, David Luiz from Paris Saint-Germain, and Fiorentina full-back Marcos Alonso, all of whom were key to their victory.
But who did other title winners sign before they won the Premier League? Click the right arrow above to find out…