The boss previews his side's encounter at London Road
Millwall striker Lee Gregory will have a late fitness test ahead of Saturday's game away to Peterborough United (3pm).
The striker suffered a blow to his ribs in the latter stages of Tuesday's 2-2 draw with Wigan and boss Neil Harris has confirmed that Gregory will be given all the way up to kick-off at London Road to prove his fitness.
Discussing his selection options ahead of the game, Chopper said: "Greggs is a great fella, a team player and a strong individual mentally. I was trying to get him to come off the pitch but he didn't want to come off.
"Everyone could see that we played the last six minutes plus six minutes of added time with 10 men with Greggs just standing in the middle of the park, but he didn't want to come off. He wanted to be there with his team to see it over the line but it wasn't quite to be.
"We have to monitor him. It was a heavy whack on his ribs that he got so we will give him all the way up to kick-off to prove his fitness.
"Other than that we're looking pretty good. Hopefully Sid (Nelson) will get through training and be available, plus Shaun Cummings and Joe Martin are getting fitter and stronger every day. There is certainly competition for places."
Tuesday's draw at the DW Stadium extended Millwall's unbeaten away run to five games - a record they will be hoping to improve at London Road this weekend.
They face a Peterborough side now under the management of Graham Westley, who has seen his new side win one and lose one of his two games in charge so far.
And Harris insists that he and his coaching staff will again be working hard on putting together what they hope to be a successful game-plan - and has backed his players to be able to carry it out.
"We spend a lot of time studying the opposition," he added.
"We're really respectful to them and how they play and we try and give the players a game-plan, a formula and a structure to build from.
"The players have really embraced that and the upturn in fortunes has definitely coincided with a little bit of consistency on the pitch and in the way we are playing.
"I'm always open to fresh legs and thinking about formations and tinkering if needs be. But at the moment the players are certainly confident."
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