The young Sweden fullback left Blackburn Rovers for Norwich last week. Olsson's former club Högaborgs BK will receive €1.2 million as part of the deal.
"There is a lot of money for us and we really need every penny. We have had a tough time financially in recent years. This money will come in handy to stabilize the business. Caution will apply.
"There will be no major investments or expensive signings," Hogaborgs chief Kenneth Karlsson said.