Reports have suggested United could bring in Dede as a long-term replacement for Rio Ferdinand.
“No offer has come yet,” he told Globo Esporte.
“I am glad to be compared to a great defender like Ferdinand, but I am only focused on Vasco.
“I was at the national team when a reporter asked me if I will join Juventus.
“I said I like them as they are a big European team, but at this point I am focused only on Vasco.
“If I leave, it will be in a more distant future. Rumours do not affect me.”
Benfica and Juventus are also reportedly keen on Dede.