The trio trained on Saturday at Visy Park, albeit lightly in a session in front of a navy blue army pumped for the Blues' sudden entry into the finals.
While assistant coach Brad Green admitted some doubt remained over all three, they each put forth solid cases in the hour-long hit-out.
Judd moved well, although looked ginger at times as he gathered ground balls, took part in end-to-end drills and jogged with his left knee heavily strapped.
Scotland and McLean kicked to each other at the end of the session and practiced full paced leads out of the goal square.
Green said the trio had to get through the session to play but was confident they would if they declared themselves fit.
"If all three are putting their hands up, all three are fit," Green said.
"We don't see it that we're taking in three unfit guys. If everyone clears them, they're out there playing.
"At this point in time, we assume all the guys are going to get up but we have another training session to do today and hopefully they can pull through and play tomorrow."
McLean has missed two with a quad injury while Scotland was a late withdrawal last week from the Port Adelaide game, also with a quad.
Judd has missed three games with a medial ligament injury that had him in a brace for two weeks with the initial idea he wouldn't play again this year.
Green said there were no concerns over the strength of his knee despite the injury occurring in round 20 against the Western Bulldogs.
"He's had three weeks out, he's trained solid all week but there's still this training session to go," he said.
"But Chris is as professional as they come, he's played a lot of finals, he's played in Grand Finals and he's going to help our side if he plays tomorrow.
"If Chris Judd is putting his hand up, I'm sure Mick will listen.
"Chris is as professional as they come and he's been training really hard doing off-leg stuff all the way through and he's keeping his fitness right up there.
"We're playing finals footy and he's raring to go if he gets through."
Meanwhile, Green said the Blues were determined to make their presence felt in the finals after gaining a late call up through the forced removal of Essendon as a result of the supplement saga.
While the Tigers knew in round 19 it was likely they would play finals, the Blues have had less time to get used to the idea with Essendon sanctions handed down just under two weeks ago.
Green said that wouldn't matter on game day.
"Not at all, we earned our spot, we deserve our spot in the finals and even the last three games have been tough finals footy type games and we are looking to win the game tomorrow," he said.
"Tomorrow is all about winning; certainly, I believe we are here to win, no doubt."
Green said the Blues' recent finals experience in 2009-11 would help, particularly compared to the Tigers, who have just four players who have played finals expected to line up.
"I think it is an advantage for our guys, but when that ball bounces, it is going to be on," he said.
"But our boys have played finals in the last few years and that gives them a little bit of experience going into the week."
Twitter: @AFL_JenPhelan
