The good thing about Lambert is that you know everyone will get a fair chance and the ones that manage to perform will get their place in the starting XI.
The goalkeeper is easy, we've got an excellent one in Guzan. That is probably our best position.
Lowton has made the right full back position his own. He's only going to get better next season.
Left back is the position that I think will be settled in pre-season training and games. Lambert will give it to the one who deserves it out of Luna and Bennett.
Plenty of competition between the CB's in Vlaar, Okore, Baker and Clark. Vlaar and Okore will probably be first choice but I wouldn't be surprised if Baker manages to knock either one of them out the starting XI.
We're crying out for a creative central midfielder and that is a position Lambert will probably fill in the summer months. The other two positions will be battled out between Delph, Sylla, Westwood, Bacuna and hopefully Gary Gardner. Westwood IMO is pretty nailed on to be in the starting XI but the other position is more difficult. Delph was fantastic in the latter third of last season but is he good enough? Sylla as well but he still needs lots of work to improve his game. Bacuna and Gardner could well surprise us.
If Benteke stays then Helenius will be his understudy. The wing forward position will filled by Gabby, Weimann, Tonev, N'Zogbia and maybe Carruthers.
-----------------------------Guzan
Lowton-----------Okore----------Vlaar----------Luna
--------------------Westwood----Sylla
Weimann-------------------AM----------------Gabby
-------------------------Benteke (hopefully)
Subs:
Siegrist
Tonev
Bacuna
Baker
Bennett
Delph
Helenius