Legends like Alan Shearer, David Ginola, Paolo Maldini and Andriy Shevchenko were all mentioned on Harper's Twitter feed yesterday, as well as a date of September 11 this year.
All proceeds will go to charity but given Harper's long service at United it is unlikely to lack support.
Harper Tweeted: “Another testimonial meeting done & we’re nearly there. Announcement next week hopefully. Shearer, Ginola etc v (Franco) Baresi, Maldini etc.
“(Christian) Vieri, Shevchenko, (Alessandro) Costacurta too confirmed. Just waiting for co-operation from all parties to confirm. Hopefully on Wed 11th Sep #all4charity.”
Source: Newcastle United Mad