Chris Wilder insists his summer transfer target will remain 'under wraps'.
The signing of Manchester United goalkeeper Dean Henderson was United's first move in the summer window earlier this week and Wilder remains focused on securing his other targets.
The manager remarked: "I'm not going to tell everyone else who we're after.
"There are some lazy clubs out there who might think he's a decent player, lets offer him, the club and his agent more money and then all our hardwork goes out of the window, so we keep our business under wraps.
"I want to get the team right and I want to bring in some really good players into the club this summer and Dean Henderson is a fantastic start."
Wilder added: "I won't be able to get all our targets in on permanent deals, but we're still looking for two, three or four quality additions.
"I'm grateful to the owners for the increased budget, but when you look at the likes of what Forest are spending and what Vydra is supposedly going for, these are numbers we still aren't competing with."