Stuart Holden and Gretar Steinsson returned to training this week where they were joined by new recruit David Wheater.
"It's a boost to have any of my players fit because we're not blessed with numbers," Coyle told Bolton's official website.
"It's nice to have both Stuart and Gretar back in training and it adds more competition for places, but they won't be involved on Monday unless they're fully fit.
"As far as David is concerned, he will go straight into the squad for the game against Chelsea. We only had 17 last time out against Stoke City which was quite a lot for us because we'd had 15 in the game prior to that.
"He's the first signing (of the transfer window) and we'd obviously love to add a couple more faces, but at the same time a number of boxes have to be ticked and we won't be bringing anyone in who isn't suitable to the football club."