Lions boss Neil Harris has explained why he feels Jason Shackell has all the attributes required to help Millwall thrive during the remainder of the 2017/18 campaign.
The Derby defender will see out the season in SE16 after putting pen-to-paper on a loan deal.
"I am really pleased Jason Shackell has come in," Harris told millwallfc.co.uk.
"We have been chasing an experienced centre-half over the course of this transfer window.
"People might look at it and think "that's unusual for us to go and sign a 34-year-old," but I have done it because he is hungry. He is a really good one for us to bring in.
"I love what we are currently doing here at Millwall; we have a great group of lads and some good young kids coming through, but I felt like we maybe need a bit more experience.
"You can never have too many experienced players in the team or in the squad to lead. I felt that in the back-line we maybe needed another voice and some guidance.
"If we want to keep progressing as a team, as a squad, as a club, then our standards have to keep right up there. By bringing in senior players who have been there and done it in the Premier League, as well as at the top of this division, can only guide us as a group."
Fans may not have long to wait to see the defender in action, with the manager admitting his latest signing may be called on when Millwall host Rochdale in the Emirates FA Cup this weekend.
"He hasn't played a lot of first-team football recently but he is fit and may well come in," Harris added.
"It's a possibility that he may come into the squad this weekend, yes."