Ryan Giggs reckons Manchester United teammates Wayne Rooney and Cristiano Ronaldo have the Premiership rattled.
"Wayne and Cristiano are still so young and they will keep on improving and keep working at their game.
"People forget how young they are because they are so consistent at such a young age, it's unbelievable.
"It's a great prospect for us but a frightening one for everyone else.
"And now they have won their first title, it will only make them more dangerous.
"United and Chelsea are very close and all of the top four clubs are capable of winning the title.
"But I feel as we are the champions, we will hopefully have the edge going into the season."