"That's two games running - against Doncaster and Swansea - that we've been on the back foot and struggled to play the way I know we can," said Coleman to the CT.
"We never bossed it as I expected us to because we had one or two under-performing, so I need to address that and I will address it.
"The squad's getting richer now so I can leave one or two out - and maybe there will be one or two surprises.
"It would be nice to mix it up a little bit and give ourselves a few more options.
"Finger's crossed we'll have another new face in this week but the market's very difficult at the moment and we've missed out right at the death a couple of times now.
"The problem was that we weren't on the button - we were reacting rather than anticipating which are two very different things in football.
See the goal here http://news.bbc.co.uk/sport1/hi/football/eng_div_1/8217561.stm
Copyrighted pictures from the game here
http://footymad.sportbox.tv/photos/imagepopup.php?sport_id=1&team_id=6