Stuart McCall will deliver his verdict on the City trialists after Saturday's friendly at North Ferriby.
The pre-season numbers have been swelled by a clutch of hopefuls trying to earn a proper deal with the club.
But once the third game in a week is out of the way, McCall plans to sort out which players he wants to keep for closer inspection ahead of the League Two kick-off on August 11.
Simon Johnson, Scott Phelan, Darren Williams, Kyle Nix, Peter Leven and Kris Gate will be sweating on the manager's decision. Barnsley duo Nathan Joynes and Thomas Harban are also waiting to see if they will be offered the chance of a long-term loan.
McCall said: "Saturday will be the last game when we make a lot of changes. After that, I'll make a decision about a few of the lads who've been on trial.
"I told their agents that I'd do that once we got the first week out of the way, when we've had time to have a decent look at them.
"It's not just the three games so far but we've obviously seen what they've been doing in training and how they are mixing with the rest of the lads."
Young striker Joynes cannot feature at Church Road tomorrow because players on trial from another club are only allowed to make two appearances. Right back Harban is all right, though, having sat out the opening friendly at Harrogate.
City were straight back in for training this morning after last night's 2-1 loss to Farsley Celtic and McCall expects to see an improvement in East Yorkshire.
"I know it's only a friendly but I was disappointed to lose at Farsley," he added. "I don't like losing whatever I do.
"We gave them too many chances in the first half, although I thought we were better in the second and could have had a few goals ourselves.
"It was good to see Peter Thorne get on the scoresheet. Barry Conlon could have had a couple in the second half and Joynesy might have had a hat-trick but it was another game to get some fitness under their belts."
McCall wants to see more supply from his wingers. The widemen saw plenty of the ball at Throstle Nest, particularly Joe Colbeck in the first half, and the City boss is hoping for more end product.
"If we play with two wide men then we need to get balls coming into the box. Once the crosses do come in, the chances are there and we've got the guys to get on the end of them.
"But pre-season is all about working on things and there are certain areas we can look at on the training ground."
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