The club also signed Colombian forward Dairon Asprilla and Brazilian defender Jeanderson Salvador Pereira; exercised its purchase option on Jamaican defender Alvas Powell; and traded veteran fullback Michael Harrington to the Colorado Rapids.
The 26-year-old Kwarasey currently plays for Norwegian club Strømsgodset, which he has played for since 2007. In 2013, he won the league's Goalkeeper of the Year award after leading them to the second championship in team history.
Kwarasey has played in 23 games for the Ghana national team since debuting in Sept. 2011. He played in all six matches during the 2012 Africa Cup of Nations as the team finished fourth. He also started in Ghana's 2014 World Cup group stage match against the United States, a 2-1 American victory.
Donovan Ricketts has been Portland's starting goalie for the last two seasons. He finished last season 12-7-12 with seven shutouts while making 105 saves en route to a 1.38 goals against average.
Portland traded allocation money to Real Salt Lake City to acquire the 33-year-old Borchers. The defender, who appeared on the 2010 MLS Best XI team, was a nominee for the 2014 All-Star game.
Borchers played for Real Salt Lake since 2008. He started his MLS career with the Colorado Rapids in 2005. Sports Illustrated's Grant Wahl initially reported last week that the Timbers had acquired Borchers.
Asprilla, 22, played for Alianza Petrolera of the Colombian Primera División. He scored five goals in 17 matches during the 2014 Torneo Finalización. After joining Alianza Petrolera on loan from Atlético Nacional in 2012, he scored 10 goals in 2013 to lead the club to promotion to the Primera División.
Pereira, a 23-year-old left back, helped Cruzeiro de Porto Alegre reach the quarterfinal of the 2014 Campeonato Gaucho. He signed with Santa Rita this summer.
Powell, 20, tallied 15 appearances for the Timbers this season. In August 2013, he became the youngest Timbers player to ever start and play in a match. The Timbers announced Monday they would sign Powell to a long-term contract, fully taking over the Jamaican's rights from his ex-club Portmore United.
The Timbers finished with 49 points last season, good for sixth place and just one point out of the final Western Conference playoff spot.
- Paul Palladino