Bolton suffered their fifth successive defeat, following the defeat to Chelsea on Sunday.
“My feelings are of immense disappointment,” Coyle told Sky Sports.
“First and foremost the fans, they were magnificent and frustrated because we have not given ourselves a chance today, conceding a goal after 90 seconds from a set-piece and the players know better than that.
“We gave ourselves a mountain to climb, not being cut open but individual error – but we came out second half and showed character, scored one goal, scored another not allowed, it would not have made any difference but it did underline that character.”
Jussi Jaaskelainen’s understudy Adam Bogdan gifted Chelsea two of the goals.
“Young Adam Bogdan will a have a terrific career but he had a tough day today, but that can happen and sometimes confidence can go,” admitted Coyle.
“But second half I thought they had spirit and they showed real character and desire to do well for the supporters and they deserve more than what we are showing them at the moment and we have to offer more, we have had a difficult run of games but we still have to offer more than that.”
