Phillip Cocu was tight-lipped on reports linking Derby with a move for former England captain Wayne Rooney after his side's 2-1 Sky Bet Championship victory at Huddersfield.
The DC United striker has been linked with a possible player-coach role at Pride Park.
Cocu offered few clues as to whether there was any truth in the rumours following Monday's win.
Asked whether Rooney would get into his side after they opened their season with a victory, Cocu joked: "Who?
"I'm sorry, I can't say (anything). There are still three days and the market's open.
"I've said before that we're not done and we're working to get the team complete, but I cannot talk about any names at this moment."
Cocu was probed on how a player of Rooney's profile might fit into his squad.
Without mentioning Rooney specifically, he added: "It never depends on a player because I like to talk always about my team, not about any player.
"In my opinion the team is always the most important. Never is a player more important than the team. That's my vision."
Despite asserting that his coaching team is complete, Cocu replied "I don't know" when asked if there was room for a player-coach.