A three-match winning run in March was followed by consecutive defeats, before a battling point at home to Swansea at the weekend.
"We're not a team that has been struggling for form," Coyle said.
"We have 10 points from the last 18 and if we can return that in our last five games that's enough to stay in the Premier League.
"If we do that then the whole picture changes very quickly.
"Regardless of the people we have missing, we have enough quality to stay in the league."