Baker ended his long-term stay at Villa during the summer in order to move to the Robins on a permanent basis after previously playing 38 times for City in a loan spell during the 2015-16 campaign.
However, Jens Hegeler is missing from the squad after picking up an ankle injury earlier this week, but Korey Smith returns to the team after beginning the win over Watford in the EFL Cup on the bench.
Bristol City: Fielding, Pisano, Baker, Wright, Bryan, Brownhill, K.Smith, Pack, Paterson, Reid, Diedhiou.
Subs: Lucic, Magnusson, Flint, O'Dowda, Eliasson, O'Neil, Woodrow.
Aston Villa: Johnstone, Elmohamady, Taylor, Chester, Samba, Terry, Whelan, Hourihane, Onomah, Green, Davis
Subs: Steer, Lansbury, Hogan, Agbonlahor, Bree, Bjarnason, Adomah