Allen has not played since sustaining a hamstring injury with Swansea in September. He has 72 caps with the national team.
Wales were drawn into Group B in Qatar along with England, USA and Iran. The Welsh will begin their journey on November 21 against the United States.
Goalkeepers: Wayne Hennessey (Nottingham Forest/Eng), Danny Ward (Leicester City/Eng), Adam Davies (Sheffield United/Eng)
Defenders: Ben Davies (Tottenham Hotspur/Eng), Ben Cabango (Swansea City/Eng), Tom Lockyer (Luton Town/Eng), Joe Rodon (Rennes/Fra), Chris Mephan (Bournemouth/Eng), Ethan Ampadu (Spezia/ Ita), Chris Gunter (Wimbledon/Eng), Neco Williams (Nottingham Forest/Eng), Connor Roberts (Burnley/Eng)
Midfielders: Sorba Thomas (Huddersfield Town/Eng), Joe Allen (Swansea City/Eng), Matthew Smith (Milton Keynes Dons/Eng), Dylan Levitt (Dundee United/Eco), Harry Wilson (Fulham/Eng), Joe Morrell ( Portsmouth/Eng), Jonny Williams (Swindon Town/Eng), Aaron Ramsey (Nice/Eng), Rubin Colwill (Cardiff City/Eng)
Forwards: Gareth Bale (Los Angeles FC/USA), Kieffer Moore (Bournemouth/Eng), Mark Harris (Cardiff City/Eng), Brennan Johnson (Nottingham Forest/Eng), Dan James (Fulham/Eng)