Yes, indeed Stephens wants in, so a midfield of Stephens-Kayal.
If practicing 3-5-2 then :
Krul
Schelotto
Goldson
Hunemeier
Dunk
Suttner
Knockaert
Stephens
Kayal
Hemed
Baldock
If 442 :
Krul
Bruno
Goldson
Hunemeier
Bong
Knockaert
Stephens
Kayal
Skalak
Hemed
Baldock
The main importance is to make sure Pröpper, Groß and Murray are rested for Southampton.
Maybe rest Stephens as well, although that makes the central midfield selection trickier.