Tinnion has also revealed that he is on the lookout for a replacement for Lita.
Tinnion said: "When it became evident that Leroy could be leaving we started working with Brooks and Marcus.
"They will be paired in the friendly at Hereford on Saturday as they need every opportunity to work up an understanding.
"They are the senior strikers, but I'll be looking to bring another one in now that Leroy has moved because it is essential we have fierce competition in all areas of the squad."