George Wood/Getty ImagesSunderland are set to return with another offer for Sporting Lisbon star Geny Catamo despite the Portuguese outfit having ‘immediately rejected’ their opening bid. Keen to accelerate matters, the Black Cats ‘submitted a proposal’ in the hope of prising the Mozambique international away from Sporting Lisbon. Sunderland though ‘promise to return with another offer’ for the wide-man, appearing to be convinced that he would be a real game changer at the Stadium of Light. Catamo remains a prominent member of the Sporting Lisbon set-up, having started their opening league fixture against Estrela da Amadora and marked the occasion by supplying an assist. Sunderland also have needs elsewhere in the squad that will require a financial commitment.