Olsson, 34, would have been out of contract in the summer, but has reached a mutual agreement with Albion to terminate remaining months of his deal.
Asked whether he had other options with another U.S. club, Diskerud said only: "Yes and no."
U.S. international Mix Diskerud has sealed a loan to Swedish side IFK Goteborg following his tumultuous exit from New York City FC.
U.S. international Mix Diskerud is close to securing a loan to Swedish side IFK Goteborg, an MLS source told ESPN FC.
Isak became the youngest player to ever score for Sweden when he struck in the 6-0 win against Slovakia on Jan. 12.
Borussia Dortmund have made a late move for AIK's Alexander Isak and the player could now pick BVB over Real Madrid.