It has emerged that Miss Dell'Olio, 37, will join Eriksson in Dubai on a pre-World Cup break next month with the England team, their wives and girlfriends.
It is believed the trip cannot be cancelled because of commercial deals to which the couple are committed.
Eriksson dodged a barrage of personal questions during a press conference to launch the new England suit. He said: "About my private life, I want to have that private."
Meanwhile, Miss Jonsson's mother Gun Brodie urged Eriksson to choose her daughter over Miss Dell'Olio. She said: "Ulrika is always happy when she talks about Sven."