1) Salisu has not had a single cap for Ghana, so why do you think he'll be going to the African Cup of Nations?
2) Stephens was reported to be out for "upto 12 weeks" from an injury 18th September. Which would be returning anytime up to 11th December.
https://www.southamptonfc.com/news/2021-09-21/ralph-hasenhuttl-on-jack-stephens-injury-southampton-football-club-21-september-2021