The 22-year-old right-back remained on loan at the Sounders until January 2015 before joining the North London outfit.
The USA international, who can also play as a wide midfielder, struggled for playing time during the second half of the 2014-15 season.
Yedlin could feature just once in the Premier League for Tottenham and was sent out on loan to Sunderland in the summer of 2015.
The Black Cats successfully fought for survival in the English top flight during the 2015-16 campaign, and Yedlin played an important role.
In 23 league matches for Sunderland, the defender created 12 chances, had a pass accuracy of 68% and a shot accuracy of 25%, and won 24 headers, 22 dribbles and 29 tackles.
Yedlin has underlined his improvement during his season-long loan spell at the Stadium of Light, and has also admitted that he questioned himself after joining Tottenham from the Sounders.
"When I made the decision to go to Europe, a lot of people questioned it,” Yedlin told Goal.com.
“The first six months I was there even I was questioning it, but I think I learned a lot more about myself in that six months than I have my whole life.”
"In that league, little mistakes can expose you, so I've really had to cut down those mistakes," added the American defender. "I think positionally I've improved.
"One vs. one I feel more comfortable. I knew that was going to come — obviously that's the kind of thing that comes with experience."