Poulsen:
"He's a very good holding midfielder who did really well during his time in Germany and Spain," added Hamann.
"He didn't have the best of times at Juventus but he's a very clever player. He keeps the team ticking over and is a very good passer of the ball.
"I think the club should have signed him a couple of years ago, but he's here now and he's only 30 so he's got a few good years left in him.
"He'll be a great addition to the squad and is another option in that midfield."
N'Gog:
"I like the look of David Ngog," said Hamann.
"He's only young, but he's got a lot of potential and has already scored a few goals this season which will do his confidence the world of good. You could see how much of a lift it gave him after he scored against Arsenal, so hopefully he can continue to improve and be a good option in attack.
"He's a very good holding midfielder who did really well during his time in Germany and Spain," added Hamann.
"He didn't have the best of times at Juventus but he's a very clever player. He keeps the team ticking over and is a very good passer of the ball.
"I think the club should have signed him a couple of years ago, but he's here now and he's only 30 so he's got a few good years left in him.
"He'll be a great addition to the squad and is another option in that midfield."
N'Gog:
"I like the look of David Ngog," said Hamann.
"He's only young, but he's got a lot of potential and has already scored a few goals this season which will do his confidence the world of good. You could see how much of a lift it gave him after he scored against Arsenal, so hopefully he can continue to improve and be a good option in attack.