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From BBC SPORT | Football | My Club | Sunderland | Cisse completes Sunderland switch
Cisse, who was a member of Liverpool's Champions League-winning team in 2005, broke both legs during his time at Anfield and missed the 2006 World Cup because of the second injury.
He joined Marseille in July 2007 following a loan spell and scored 16 goals last season.
The Black Cats' latest signings follow the summer arrivals of Teemu Tainio, Pascal Chimbonda, Steed Malbranque and El-Hadji Diouf.
What does "a loan spell" mean?
He was loaned to another club for a period of time.
"spell" here = short period of time.