Manager Steve Robinson rued his sides defending from set pieces as they fell to defeat on the opening game of the season against Millwall.
Millwall, who are one of the favourites for promotion, took the lead on 13 minutes after Lee Gregory converted a penalty.
Aiden O’Brien extended their lead just before the break whilst Byron Webster made it three just a minute into the second half.
Speaking after the game, Robinson said: “Jamie [Reckord] going off for us was a blow but it’s not an excuse why we lost the game.
"They scored from three set plays, a rash penalty and two corners. You go in to half time thinking you’ve weathered the storm, we just needed to be a little bit better in the final third.
“We lost a goal just before half time from not looking after your man, which is basics.
"Then we started the second half and said don’t concede the first goal but we lost a goal and it’s criminal at the start of the second half and it seals the game really.
"I pride myself on set plays and from where I’ve come from, that’s what we based a lot of our play on. I’m still getting to know the players, who can do it and who can’t do it.
“A lot of them dug in today, they showed at 3-0 down they didn’t crumble.
“This is a place where you can go to shreds so we showed a lot of character to stay in the game but the disappointing part was the three goals conceded from set plays."
There is a long way to go in the season and the manager admitted there will be new players through the door soon.
“This is only the beginning of something,” he said. “It’s not a negative, there was no inquest in the dressing room afterwards but we know what we are.
“We have had a squad of players through the door in three weeks, 16 new signings and possibly 18 by Monday so they are going to take time to gel but we need them to gel quicker than what we did today."
Watch the full interview at Latics PlayerHD.