#1 Barcelona

Barcelona are not only one of seven sides to have won a treble, but they are also the only club in history to have achieved this impressive feat on two occasions.
The Catalans are the clear favourites to retain their LaLiaga title, having triumphed in the league seven times in the last ten years, while their record-equaling run of five consecutive Copa del Reys was brought to an end by Valencia in May.
The addition of Antoine Griezmann would help bolster their already impressive attack, while the capture of left-back Junior Firpo from Real Betis significantly strengthens what was a weak area for Barcelona.
Of course, they still have the services of arguably the greatest of all time in Lionel Messi, and having fallen short in his promise to bring back the Champions League to Nou Camp last season, the Argentine icon would do all in his mercurial powers to inspire Barcelona to a third treble this time around.