Brighton boss Graham Potter says there is still room for improvement after watching his side start the season with a 3-0 win at Watford.
Watford have smashed their club record transfer fee after securing the signature of Rennes' Senegal international winger Ismaila Sarr.
Hertha Berlin look set to lose left-back Marvin Plattenhardt, with the Germany international poised to join Watford.
Midfielder Dale Stephens is confident Brighton can make a strong start to the new Premier League season.
Watford have held back in the transfer market this summer but could be set to add free agent Danny Welbeck to their squad.