The American signed a new deal with Spurs yesterday.
Friedel told talkSPORT: "He is a very nice guy, very impressive.
"I met the rest of the staff [as well] and they seem a very tight-knit unit. I was well impressed with everything I heard.
"Tottenham have obviously chosen him because of his Premier League experience and for the attacking football he had Southampton playing.
"A lot of us were saying that over the last 18 months Southampton were one of the hardest teams to play against and that is obviously a lot down to him. I'm very excited to start [working under him]."
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