Marcelo insists there's no reason for more Real Madrid signings.
The left-back was asked if Los Blancos need to sign more players for the 2019/20 season.
"No, we have a good team," he replied, in an interview with BILD.
"It'll be difficult, but if we each focus on our tasks then we can win everything.
"I have been taught to compete for all titles ever since I arrived at Real Madrid.
"It won't be any different this year and we'll fight for the league, the Champions League and the Copa del Rey."
Marcelo also opened up on the difficulties he experienced during the 2018/19 campaign.
"I have learned to live with criticism and to carry on doing my thing," he said.
"I know better than anybody else when I'm doing good or when I'm doing bad.
"The criticism doesn't bother me."