After Southgate had annouced the 23 player England Squad for both friendly's against Nigeria and Costa Rica (as well as the World Cup itself), another big issue I ended up having with Southgate's squad selection process is that despite being permitted to do so (for the friendlies), he failed to select a 30 player squad for the friendlies against Nigeria and Costa Rica.
Now the reason I have a big issue with the fact he has only picked 23 players (in his squad) is that he has missed a golden oppertunity to try out a broader range of players before the WC actually starts. Which would not only increase the competition for places before they fly to Russia (1) but also might have addressed the issues the squad currently has (Especially the CB and CM issues) by trying out more players that might turn out to the the solution in question.
Anyway here the 30 Player Squad I would have picked for the friendlies in question:
Goalkeepers: Jack Butland, Jordan Pickford, Nick Pope
Defenders: Kyle Walker (CB/RB), John Stones (CB), Gary Cahill (CB), Phil Jones (CB), Harry Maguire (CB), Chris Smalling (CB) James Tarkowski (CB), Jamaal Lascelles (CB), Ashley Young (LB), Danny Rose (LB), Kieran Trippier (RB), Trent Alexander-Arnold (RB/CM)
Midfielders: Eric Dier (DM), Jordan Henderson (DM), Dele Alli (CAM/CM), Jesse Lingard (CAM/CM), Ruben Loftus-Cheek (CM), Jonjo Shelvey (CM/CDM), Scott McTominay (CM/CDM), Phil Foden (CM/CAM), Jack Wilshere (CM/CAM) and James Milner (CM)
Attackers: Harry Kane (ST), Raheem Sterling (RW/LW), Jamie Vardy (ST), Marcus Rashford (ST/LW), Leon Bailey (LW/LWB)
Basically what I have done is remove Wellbeck and Delph from the squad, added Leon Bailey (2) as well as Jonjo Shelvey, Scott McTominay (3), Phil Foden, Jack Wilshere and James Milner in Midfield (4) plus Chris Smalling, James Tarkowski and Jamaal Lascelles in Defence (5).
Notes
(1) Which in turn (likely) would result in improved performances from the squad as a whole.
(2) Lets not forget he is eligable to play for England. Plus considering how Southgate is keen on the 3-5-2 formation, it helps that he can play as a LWB.
(3) Yes I know he has decided to play for Scotland. But the fact is that until he starts playing in the Euro 2020 qualifiers, he is still eligable to play for England and considering the potential talent he has and the issues we have in the CM position, the FA need to try again to sign him up for the national team.
(4) Had they been fit enough Ross Barkley, Alex Oxlade-Chamberlain , Adam Lallana, Lewis Cook and Harry Winks could have been in contention as well.
(5) Thus the 30 player squad would consist of 3 Goalkeepers, 4 Fullbacks, 8 Centre Backs (since I am classing Walker as a CB in this case), 10 Central Midfielders and 5 Attacking players (although Bailey can also play as a LWB).