34 - year - old Ibrahimovic arrived at Old Trafford on a free transfer after his contract at Paris Saint - Germain ran out .
34 - year - old Ibrahimovic scored on his debut for Jose Mourinho 's side during their recent friendly against Galatasaray in Sweden .
34 - year - old Ibrahimovic , who scored on his debut for Jose Mourinho 's side during their recent friendly against Galatasaray in Sweden , arrived at Old Trafford on a free transfer after his contract at Paris Saint - Germain ran out .