SHAUN Hutchinson is back fully fit after "a difficult few months", Neil Harris said.
Hutchinson, 28, took part in two sessions as well as physical testing on Millwall's first day of pre-season this week.
Centre-back Hutchinson's last start was in the 3-1 defeat to Norwich at The Den on March 2.
Ben Thompson, Murray Wallace and Tom Bradshaw all took full part after their injuries last season.
"I caught up with Hutch over the summer, he’s in great nick," Hutch had a very difficult few months with injuries and various bits.
"But it’s great having him back in after he missed the last period of the season.
"Hutch missed the last period, as did Murray, Thommo and Bradders.
"Having those four players back fit and healthy and back on the start line [Tuesday] is a big boost while we’re still recruiting."
Fred Onyedinma and Tom Elliott, who are both likely to leave this summer, were also at Calmont Road.
Harris added: "Fred and Tom are with us. A lot’s been spoken about behind the scenes with players. Fred and Tom are our players, they’re contracted until I’m told otherwise. They’re in the building [Tuesday].
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