Millwall manager Kenny Jackett felt hard done by after the 2-0 defeat at Ipswich.
Jason Scotland's fifth goal of the season and a penalty from Grant Leadbitter were enough to hand the Tractor Boys a win.
Referee Kevin Friend was in the spotlight for some contentious decisions during the clash at Portman Road, which saw the penalty awarded against Danny Shittu for a foul on Tamas Priskin.
Jackett was unhappy with the decision and Leadbitter not being punished for a handball.
He said: "I thought we came out on the wrong side of the penalty decisions."
Asked if Leadbitter should have been punished for handball, Jackett added: "Yes, I do think that. I can't really see how that wasn't given, although I haven't seen the DVD. After that, Ipswich had some power, especially from set-pieces."