Hamann, who now works as a pundit for talkSPORT, has stated that there is lack of competition in the current Tottenham squad.
The former Manchester City midfielder has also backed Chelsea to win against Tottenham in the London derby this weekend.
“Competition is key, it keeps everyone on their toes,” the former Germany international wrote on Paddypower.com. “They may have two or three good players behind their starting XI but that’s about it. If players get injured, there are no options to replace them.
“Christian Eriksen has been really out of form and looks a shadow of his former self, and in that creative department they have looked poor. Yet Eriksen will play, because there is no one else there. There’s no one to challenge him for his spot, no one to push him.
“They brought Vincent Janssen in as a back-up for Harry Kane and he hasn’t set the world alight. Erik Lamela is injured and Deli Alli is a young kid so you can understand why he doesn’t have that consistency yet. It’s no surprise things aren’t going well this season.”
“It won’t be easy for Chelsea to get the win at Stamford Bridge on Saturday as Tottenham are not easy to beat,” added Hamann. “They’ve shown that by going unbeaten this season.
“But Spurs haven’t really got the same grit they showed last year, and while it may be tough, if Chelsea play anywhere near the level they have at they should have enough to pick up three points.”
Tottenham have a good squad, but at the moment most of the players are underperforming.
The injury to star defender Toby Alderweireld has been a negative factor, and the disappointing performances of attacking midfielder Christian Eriksen have not helped.
On the positive, England international striker Harry Kane is scoring goals quite regularly, and he will be a key player against Chelsea.
Chelsea will head into the Premier League match against London rivals Tottenham at Stamford Bridge on Saturday evening as favourites.
Given the form that Antonio Conte’s side are in at the moment, it is hard to see Spurs pick up all three points, but there is a good possibility that the London derby could end in a draw.