The boss also provides an injury update
Neil Harris says that 22 players will once again feature when Millwall play Dartford on Tuesday evening (7.45pm).
Two different Lions teams took on Bromley last Saturday when goals from Fred Onyedinma and Lee Gregory secured victory for Harris' side.
The next step in pre-season preparations for Millwall comes against the local Vanarama National League South side ahead of further friendlies with Crawley
and Brentford for Tony Craig's Testimonial match.
Speaking ahead of Tuesday's trip to Princes Park, Harris said: Some first team squad members won't travel as they're training in the afternoon.
"Those have played more minutes than others so far so we have to balance it off. We will still take a very competitive squad with the majority of the first team players alongside the U21s.
"There will 22 players used and it will certainly be an opportunity for some of the younger players to impress with some seniors out there getting some minutes who are trying to catch my eye also.
"It will be a tough workout."
The boss has also provided an injury update on long-term absentee Shaun Cummings as well as left-back Joe Martin, who missed last Saturday's pre-season opener at Hayes Lane.
"We knew Shaun would probably miss the whole of pre-season and we're waiting on some final test results this Thursday," Harris added.
"If those come back all clear then he will slowly start integrating into the group and we're really looking at Shaun to be back in the first team squad, fully trained and fit, come the start of September. That will be a great addition at that sort of time for us.
"Joe is a lot closer. He was very close at the start of pre-season training but just had a little set-back with the calf, which is a real tough one.
"It's not ideal losing Joe for the first couple weeks of pre-season but he is back on the treadmill and running and he will come out and join the group at the end of this week.
"We're probably looking at integrating Joe around the Brentford and Welling games so he won't be far off at the start of the season."
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