Manager Phil Parkinson is juggling fresh attacking options and a defensive injury concern ahead of Saturday’s meeting at the Stok Cae Ras.
Keillor-Dunn returned to Wrexham on transfer deadline day, six years after a brief and ultimately frustrating first spell in north Wales, committing his future to the club until the end of the 2028-29 season.
Now 28, he finds himself walking into one of the most competitive forward lines in the Championship, with Kieffer Moore, Sam Smith, Jay Rodriguez and fellow January arrival Bailey Cadamarteri all vying for selection.
Rather than being daunted though, Keillor-Dunn insists the challenge was made clear to him before he signed – and is something he is relishing.
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“[Competition] is something the manager spoke to me about before I came in,” the striker said following his move from Barnsley.
“He said ‘you’re going to love playing with these guys, you’re going to love the competition and you’ll play with some quality players’.
“The squad morale is so good. I’ve been in the changing room today and I’ve already seen that.
“I can’t wait to get that first Championship game under my belt and see the Racecourse booming on Saturday.”
Saturday’s game sees two of the division’s in-form sides collide, with real significance in the race for the play-offs.
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Wrexham have surged up to sixth place after winning six of their last eight league matches since Christmas, though the Stok Cae Ras has recently proved less forgiving, with dropped points against Norwich and Leicester in their last two home outings.
Millwall arrive in fifth, three points ahead of Wrexham but with a worse goal difference.
The Lions’ away form has faltered of late, with just one win in their past five on the road, returning five points and scoring only four goals in that run.
For Keillor-Dunn, the fixture represents another step in what feels like unfinished business at a club he believes he was always destined to return to.
His initial stint in the second half of the curtailed 2019-20 season yielded just six appearances, but he says the connection never disappeared.
“I felt like there was something that was always going to bring me back,” he said.
“My previous time here was a short stint, but I’m here for a bit longer now to make more memories. I can’t wait to get going.”
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Parkinson’s options have been boosted by the January window, though not all of his new recruits will be available this weekend.
Defender Zak Vyner, signed from Bristol City for an undisclosed fee, is set to miss the Millwall game due to a toe injury picked up before his move.
“Zak’s got a slight problem with his toe which we knew about. He was back on the grass today but won’t be available this weekend, and possibly next weekend against Ipswich in the FA Cup,” Parkinson said.
Despite the setback, the Wrexham manager is confident Vyner will prove a valuable addition once fit, highlighting his experience and adaptability.
“He’s a good player and is very experienced in this division. He gives us great versatility - he can play anywhere across a back three, he can play in a back four.
“He’s played in midfield this season and he’s played as a wing-back this season. He can play a lot of positions well.”
Vyner was one of three January signings, alongside Keillor-Dunn and 20-year-old Cadamarteri, who has arrived from Sheffield Wednesday after gaining experience at Championship and League One level.
While Keillor-Dunn is expected to push immediately for minutes, Cadamarteri may need to be patient.
“He’s played at this level (Championship) this season and he had some game-time on loan at Lincoln in League One last season,” Parkinson said.
“When you’re 20 there’s development and he knows he’s come here to work at his game with some really good players around him.
“But of course he’s someone who’s ready when called upon.”
With momentum building and competition intensifying across the squad, Saturday’s showdown with Millwall offers Wrexham a chance not only to close the gap on the teams above them, but to underline their credentials as genuine play-off contenders.
For Keillor-Dunn, it is also an opportunity to begin writing the next chapter of his Wrexham story – this time in front of a packed and booming Racecourse Ground.
