Testimonials

The Kev thread got me thinking about this. He's our longest-serving senior player, but Foden's been at the club longest. I don't know whether Kev will make it to his 10-year anniversary; I'd put it at 50-50 (and it would require a contract renewal/extension).
When would Foden actually be eligible for a testimonial? Would it be 10 seasons after his first professional appearance (i.e. 2027/28), or first appearance in a matchday squad (i.e. 2026/27)? Either way, mid-20s is pretty young for a testimonial.
The only other player that is pretty likely to get a testimonial this decade is Ederson, in my opinion.
So, which of those three are likely to get one, and who do you reckon we'd be likely to face for them?
When would Foden actually be eligible for a testimonial? Would it be 10 seasons after his first professional appearance (i.e. 2027/28), or first appearance in a matchday squad (i.e. 2026/27)? Either way, mid-20s is pretty young for a testimonial.
The only other player that is pretty likely to get a testimonial this decade is Ederson, in my opinion.
So, which of those three are likely to get one, and who do you reckon we'd be likely to face for them?