"It's been a long, hard season, but there's everything still to play for."
Frazer Richardson, David Healy, Eirik Bakke and Joel Griffiths could all come into contention from the start against Plymouth.
Meanwhile, Jermaine Beckford (hamstring) was undergoing treatment today, but loan striker Danny Graham could also come into contention.
"I got everyone together and we had a chat as team," Blackwell added. "It's been a positive season and I don't want the last few results ruining that.
"We've got ourselves up to fourth in the table and are still in with a chance of promotion with five games to go.
"That was our aim when we started out in August. The last few weeks have been disappointing, the players know that and you have to take the brickbats with the plaudits.
"We've not quite had the results we've been looking for, but I don't want people getting despondent.
"Nobody was ever going to give us anything; we have to work for it. It's up to us all to keep trying and keep plugging away."
Steve Stone, who has missed the entire season due to an Achilles injury, also joined in a shooting session for the first time since arriving at Leeds.