The Bayern Munich director, already chairman of the European Club Association, will stand in for the ex-Barcelona president in Uefa's Professional Football Strategy Council
Rosell relinquished all of his roles within the European Club Association (ECA) after standing down at Camp Nou in January amid legal issues relating to the Blaugrana's signing of Neymar from Santos in the summer of 2013.
As a result, Rummenigge, who already holds the post of ECA chairman, will temporarily take Rosell's place as one of the organisation's four representatives in the PFSC alongside Arsenal's Ivan Gazidis, AC Milan's Umberto Gandini and Evgeni Giner of CSKA Moscow.
An ECA spokesperson has confirmed to Goal that Rosell's responsibilities are still to be redistributed, but that Rummenigge has stepped into his position on the Uefa panel.
"All positions held by Sandro Rosell (Member ECA Executive Board, Member UEFA PFSC, Chairmanship ECA Marketing Working Group, 2nd Vice-Chairmanship) stay vacant for the time being. The decision was postponed to a further meeting. It will be taken before the end of the season," the spokesperson confirmed.
"Karl-Heinz Rummenigge, who already has an observer status in the PFSC, will take a more active role until the successor of Sandro Rosell is appointed."
Rummenigge, who recently called upon Uefa to take action against Paris Saint-Germain as part of the Financial Fair Play (FFP) regulations, will now have a greater say in PFSC meetings relating to all areas of European football.