The former West Ham striker says he wasn't asked but wished the skipper well.
He did wish Noble all the best, however, after responding to a follower who asked why the Welshman wasn't taking part himself.
Plenty of West Ham's former players turned out at Upton Park, including Rio Ferdinand, Trevor Sinclair, Yossi Benayoun and more.
Wasn't asked.. Never played with mark.. Hope he has a great day thoroughly deserved. https://t.co/NUSaCZGS3f— John Hartson (@JohnHartson10) March 28, 2016
Hartson would have been in good company, of course, alongside the likes of Paolo Di Canio, Dean Ashton, Marlon Harewood and other ex-West Ham forwards.
In the end, the Hammers enjoyed a brilliant day for Noble's Testimonial, with fans treated to a normal game as well as a penalty shootout.
Ashton produced two bicycle kicks, Di Canio produced his usual brilliance and goalkeeper Adrian even ran the length of the pitch to net for Noble's side.
Next up for West Ham is a Premier League clash against Crystal Palace.