Birmingham City manager Alex McLeish thought his side lacked the killer instinct as they slumped to a 1-0 home defeat to Coventry City on Monday.
Former player Clinton Morrison headed home the only goal of the match early in the second half as City lost for only the third time this season.
The former Rangers and Scotland boss said after the loss: "We had a few efforts and I thought we deserved at least a draw.
"We've lost to a set-piece and we could have had five from set-pieces ourselves.
"In the first half in particular we had a couple of inviting set-pieces and we got flicks on the end of them but we just couldn't get that ball over the line and the goalkeeper has also made some terrific reaction saves.
"We just lacked that killer instinct in the box. But it's not just about the attacking players it's about getting the service to them and it's about getting the right delivery."