Phil Parkinson conceded Aaron McLean is showing his frustration after drawing another blank in Bradford's 3-2 loss to Stevenage.
Bradford winger Adam Reach opened the scoring and after Francois Zoko had equalised, James Hanson put the home side 2-1 ahead at half-time.
McLean wasted a glorious chance which would have put City 3-1 - the former Hull striker still awaits his first goal for the club - before Luke Freeman fired in two brilliant strikes to seal Stevenage's second win in four days.
Parkinson said: "He (McLean) is snatching at things to a certain degree.
"There was nothing wrong with his all-round effort. He put in a good shift for the team, but strikers thrive on goals and he hasn't got his first for us yet, so he is frustrated."
Parkinson added: "We lost it to two fantastic strikes, but we should have done better defending their second goal.
"Everyone in the ground was shouting at us to close him down and in those situations someone has to take responsibility."
Bradford led after only 11 minutes. James Hanson nodded down Carl McHugh's high ball from the left and winger Adam Reach volleyed past Chris Day from 15 yards for his first goal since joining on loan from Middlesbrough in January.
Stevenage hit back in the 23rd minute when Francois Zoko was allowed time to switch the ball on to his left foot and score from 12 yards for his 17th goal of the season.
Bradford regained the lead three minutes before half-time. Day parried Reach's low shot at full stretch, but Hanson was on hand to fire into the top right corner for his 11th goal of the campaign.
French defender Bira Dembele headed against Bradford's crossbar before Stevenage equalised for the second time, Freeman's powerful shot beating keeper Jon McLaughlin from 25 yards in the 64th minute.
Freeman then hit the 87th-minute winner when Jimmy Smith tapped a free-kick to him on the edge of the box.