Kevin Blackwell continues to be busy as the summer transfer market heats up.

Watford have accepted an offer of £1.8m for striker Tommy Smith while his Hornets team-mate John-Joe O'Toole is also set to sign for United permanently after a loan spell last season.

Michael McIndoe meanwhile is discussing a deal after Bristol City gave the ok to a bid from Bramall Lane.

Kevin Blackwell told BBC Radio Sheffield: "We are in discussions with all three and I am sure fans will agree they are all quality players.

"We have to build a squad that will give us more options next season."

Left-sided Fulham winger Julian Gray is joining the club for a two-week trial spell.