His call-up for the fourth England squad running – the goalkeeper preserved his record of never having been beaten for the Three Lions last month, with four clean sheets in four caps – could scarcely have been in doubt.
For not only has Johnstone signed a new contract with the club, he has also kept a Premier League-high five clean sheets so far this term (sitting joint top with Nick Pope).
What's more, his current clean sheets to top-flight appearances ratio (8 out of 21) is the best of any Crystal Palace goalkeeper in history (as initially highlighted by @SoCpfc).
Speaking to David Seaman’s podcast Seaman Says last week, over the course of an insightful hour, Johnstone delved into the details which define his game – week in, week out.
From his method of pass selection, to how he maintains his goalkeeper gloves, here are just a selection of Sam Johnstone’s insights from the in-depth chat…
Johnstone on choosing where to kick...
“I always think about where the ball is going to go next.
"If I pass it to a centre-half, has he got another pass on, or is he just going to put it back to me, or boot it long? It’s a tough one.
“Playing out from the back, everyone has to be on the same page, and it’s tough, but also good at the same time.
“Teams are able to adapt now – we do, anyway. At Burnley, the first goal-kick we played short, they pressed… so we went long for the rest of the game.
“[The Palace defenders] are brilliant. They’re very good. Marc Guéhi’s only 23-years-old and he’s unbelievable. He’s mature, a top player, and can do both – can play with the ball at his feet, and go long. His composure’s unbelievable. The same with [Joachim] Andersen on the other side.
“It’s great to play behind them.”