The newly-promoted outfit have been fairly active in this summer's window, but Fernandez is still hopeful of adding to his squad before the start of the La Liga campaign this weekend.
"I thought we would have some players by today, but we have to remain positive. The team is very unbalanced, we need signings to correct those balances and to have alternative options. We are working diligently, day and night, to get the players we need," he told reporters.
Deportivo finished second in the Segunda Division last season.