Mattus won the 1990 World Cup championship at the Olympic Stadium in Rome, and he donated his signature jersey to the Olympic Stadium.

In the 1990 Italian World Cup final, Mattus led Germany to defeat Argentina 1-0 and won the championship. The World Cup final was held at the Olympic Stadium in Rome, and 35 years later, Mattus returned to the stadium and donated his signature jersey from the German national team in the 1990 World Cup to the Sports and Health Department of the Olympic Stadium.

Matus's jersey is exhibited at the "Legendary" exhibition at the Olympic Stadium. It displays many jerseys and other equipment from champion players who have written history on this stadium. It is a must-see check-in point for tourists who come to visit the stadium.

Mattus said: "To me, this stadium means a unique and unforgettable emotion." Mattus also won the 1980 European Cup championship at the Olympic Stadium in Rome. In addition, in the 1990-91 season, Mattus won the League Cup championship with Inter Milan on the stadium.