West Ham's defeat leaves them in the relegation zone and Pardew knows he is under huge pressure to get some points on the board over the Xmas period.
He told the official site, “If ever there's going to be an examination of our spirit and character then Bolton will provide it, so I've got to go away and put out a side that can cope with the physical way in which they play.
”After the performance against Wigan, I'm tempted to change things around. So far, I've been pretty loyal to my tried and trusted players but I've got to decide between now and Saturday whether I'm going to stay that way. After all, this is the time when I now need to see a reaction from my players.”