Derby's hopes of Premier League football were ended in the playoff final at Wembley on Saturday, where they lost to Queens Park Rangers.
"The next stage is keeping the players we have under contract together," McClaren told Sky Sports News.
"I'd like to sort out the likes of Wisdom and Thorne and Bamford. Maybe we have a chance of getting them back because I think they've enjoyed their time here.
"We'll look back with a bit of anger, sadness and remorse but in a few days when we talk of the future, it looks bright."
Derby ended the regular season third in the Championship table.