The Blades have suffered a number of postponements in recent weeks, complicating their recruitment plans.
Heckingbottom has admitted he “can not afford” to let anyone leave until the “picture becomes clearer".
Here are the best of today’s Championship rumours...
1. Baggies eye Newcastle midfielder
West Brom are reportedly interested in signing Newcastle United's Sean Longstaff. The midfielder is facing uncertainty over his future following the Magpies' takeover. (Football League World) Photo: Alex Morton
2. West Ham consider Robins swoop
West Ham are reportedly weighing up a summer bid for Bristol City teenager Alex Scott. The 18-year-old has made 27 appearances in the Championship this season. (Football League World) Photo: Alex Davidson
3. Arsenal ace makes Djed Spence claim
Arsenal's Gabriel Martinelli has named Djed Spence has the toughest player he has faced. The Gunners are targeting the Middlesbrough defender following his successful loan spell with Nottingham Forest. (Metro) Photo: Michael Regan
4. Terriers boss an option for Leeds United
Former Leeds United defender Danny Mills has suggested that the Whites could appoint Huddersfield Town boss Carlos Coberan if they are relegated this season. The Terriers currently sit in a play-off spot in the Championship. (Football Insider) Photo: Robbie Jay Barratt - AMA