Drissa Diallo and Sean O'Hanlon

O'Hanlon joins the Dons from Swindon Town with a fee for the 23-year-old, who is out of contract this summer, due to be set by a tribunal.

Diallo arrives at the National Hockey Stadium as a free agent after being released by Sheffield Wednesday.

The 33-year-old has had previous spells with in the Championship with Ipswich Town and Burnley.