The 19 year old forward is currently on loan to League Two club Rushden & Diamonds where he has netted a cool 9 goals in 16 games including a hat-trick against Boston United in a 4-2 victory.
Billy Sharp: Not For Sale!
"I've watched videos of Billy in action for Rushden and he's done well," Warnock told sufc.co.uk.
"There are already four clubs that will take him next season but we won't be selling any of our young players.
"I'm going to see how he, and a few others, come back for pre-season and how we change our squad over the summer."