The Brighton man arrived to some fanfare in the summer after his displays for Blackburn last season but has failed to hit similar heights, starting only four times for the promotion-chasing Blades.
The winger has since joined Birmingham City on loan, saying: “When I got the call that Birmingham wanted me, I was excited to go somewhere and get some minutes and play more.”
We asked Blades fans on social media who they would like to see brought in as a realistic replacement, given budget limitations and squad profile at Bramall Lane. Here are some of the most popular options – including some familiar faces, lower-league gems and top-flight forwards ...
5. Gary Madine
A former Blades striker, Madine was a popular suggestion with Joey McGregor, Jordan Paterson, James Kemp and Josh Brearley amongst those keen to see him return to Bramall Lane. But again a loan move would seem unlikely for one of Blackpool's key men Photo: Gareth Copley
6. Oscar Bobb
Blades fan Sam Tweed suggested a move for the Manchester City youngster, looking to build on the good relationship United have with City after the loan moves of Tommy Doyle and James McAtee Photo: Jan Kruger
7. Adam Armstrong
Blades fan Martin Brockles would be keen to see Armstrong arrive, adding: "He scores for fun in the Championship." Is part of the Southampton squad at present so may not be available to loan Photo: Warren Little
8. Sam Surridge
One of Forest's array of strikers, Surridge's name was floated by Adam Weightman, @sufclogan and Ross Flatters amongst others. Has played 15 times for Forest this season, most recently in their FA Cup hammering at Blackpool at the weekend Photo: Catherine Ivill