Simone Inzaghi did not hide his frustration at Romelu Lukaku's struggles in front of goal after Inter lost 1-0 to Fiorentina on Saturday.
Inter's losing streak in Serie A was extended to their worst in six years as Giacomo Bonaventura's second-half header proved decisive at San Siro.
The Nerazzurri have now lost three straight top flight matches, with Bonaventura's winner coming shortly after a woeful miss from Lukaku.
Having rediscovered his goalscoring touch while on international duty with Belgium, Lukaku was unable to transfer that form across to his club side as he failed to hit the target from close range with the goal gaping.
No Inter player had more shots than his three, with Lukaku not managing to get any of them on target, despite accumulating 1.2 expected goals.
While not pinning the blame entirely on Lukaku – who is reported to have confronted Inzaghi about a lack of opportunities while he has been fit this season – Inter's coach was quick to point out the importance of those misses.
Speaking to DAZN, Inzaghi said: "If he had scored those chances, Lukaku's performance would be judged in a very different way.
"His role is to create the opportunities, make the movements that the team needs.
"He wasn't the only one who had chances today, so I wouldn't focus only on Romelu."
Inzaghi also stressed he is ultimately responsible for turning Inter's fortunes around.
"There is great disappointment, we lost two consecutive home matches," he said. "We need to work more, starting with me.
"At the moment, we need to be more determined, because we had so many chances to score and we should have done.
"I cannot ask for more in terms of effort, as the players did everything I asked of them."
Inzaghi is not wrong. While Fiorentina had more shots (19 to 16) and got the same number of attempts on target (three each), Inter finished with a 2.8 xG compared to the visitors' 1.2, suggesting the quality of opportunities that went their way was far greater.
Lukaku's glaring miss came from by far the best opportunity of the match, with Opta's model estimating the chance would be converted 92 per cent of the time (0.92 xG).
The 29-year-old's future is uncertain. He is on loan at Inter, but due to return to parent club Chelsea at the end of the season.
Before the match, Inter chief Giuseppe Marotta told DAZN: "[Lukaku's] love for the Inter jersey is 10 out of 10, we'll evaluate the prospects with Chelsea."
