"Lambert is the obvious threat for Fulham on Sunday," Niemi told Fulham's official website. "It's great to see a player like him, who was not known by the big audience so to speak, until he joined Southampton. Even then, people were saying, 'well it's the Premier League next and that's a different story'.
"Well, he's been absolutely fantastic, scoring four times in six games already. He's a big, physical player who finishes really well so I think Brede Hangeland and Mark Schwarzer will have to be on their toes this weekend.
"Mark's been at the top of his game for 15 years now – he's a goalkeeper I admire so much and he proves it's not about your age. It's about how they play and obviously they've been injury free which helps a lot."
Southampton are 17th in the Premier League, while Fulham are just in the top half in ninth.