The latest names in the frame for summer moves to Nottingham are Middlesbrough midfielder Grant Leadbitter and Algerian striker Rafik Djebbour.
Leadbitter was a key figure for 'Boro last season and had been expected to form a partnership with recent signing Dean Whitehead in the upcoming campaign.
Djebbour is keen on a move away from Greek champions Olympiakos.
Jonathan Greening will combine being part of the Reds' first-team squad this season with a role coaching the club's Under-21 side.
***Update***Reports in the North-East suggest Middlesbrough have turned down bids of £400,000 and £800,000 and have 'no intention' of letting Leadbitter go.
Djebbour, meanwhile, is thought to have rejected a full medical with the club leading to a deal being scrapped.