But he has grown before Southgate’s eyes and proved the England manager’s initial hunch was spot on.
He is one of only five players to have started all three of these World Cup qualifiers – a sign of the faith Southgate has in him and the manager’s desire to squeeze as much experience as he can into him ahead of the Euros.
That would appear to be a hint as to his intentions although Phillips’ selection in the 23-man squad may ultimately depend on the fitness of Jordan Henderson who remains sidelined with a groin injury.
Henderson is likely to be back later this month for Liverpool if there are no complications but Phillips, 25, has shown he can play his part if needed.
While that points to the cautious, pragmatic streak in Southgate, it is simplistic to see them as mere tailors’ dummies, giving Harry Maguire and John Stones someone to chat to during England attacks.
Phillips did have some licence to roam forwards last night and found himself in some semi-promising shooting positions only to pass on the responsibility.
That was a pity as he strikes a fine ball – he had shares in the set-piece duties on Wednesday night – but his main role remains primarily destructive rather than constructive.
Winning the ball back quickly has been one of England’s strengths in this international window and Phillips and Rice have played a key part in that.
When the Poles moved to 4-4-2 at the interval there was more space but it remained a combative contest with the visitors, led by their former West Bromwich Albion man Grzegorz Krychowiak not shy of a tackle. Phillips needed treatment after winning a challenge against Piotr Zielinski and taking some afters for his trouble.
It was a physical affair of the kind rarely seen these days with Dutch referee Bjorn Kuipers happy to officiate it as a contact sport and keep his cards in his pocket. The shoulder barge was back in vogue at Wembley and Phillips did not mind that.
His aim is to return to Elland Road after his time with his country as more of a leader. While that is not an obvious characteristic in him – his off-field nature is smily and easy-going – he can fight the fight on it.
From the Championship to the European Championship in 12 months for a player who had never previously featured for England at any level? It doesn’t sound so daft now.
England ratings from Matt Dunn inside Wembley
Nick Pope – 6
Stones seemed determined to end the run of clean sheets. Nothing he could do in the end.
Kyle Walker – 6
Always brings a certain swagger to right back – although offered little going forward.
John Stones – 5
Another challenging opponent, another horrible blunder. But supplied the knockdown for Maguire’s strike.
Harry Maguire – 7
Proper member of the centre-back union, rescuing England right at the end. Got away with a handball.
Ben Chilwell – 7
Used his club understanding with Mount to good effect down the left flan
Declan Rice – 7
Excellent anticipation broke down Poland’s play – a bit less sideways passing perhaps.
Kalvin Phillips – 6
Quite content to do the thankless squirrelling around snapping up the scraps.
Mason Mount – 8
Another impressive performance from Chelsea’s answer to the Duracell bunny.
Phil Foden – 7
Immaculate first touch makes him a great outlet. Little end product on this occasion.
Harry Kane – 7
He comes deep, he goes up top, he never misses, from the spot. But England needed more.
Raheem Sterling – 8
Earned the penalty and created the most mischief. Still not brilliant best, though.