Arsenal boss Arsene Wenger has admitted that the signing of
"For him, one against one with the goalkeeper, he is a good goalscorer," said Wenger - quoted by the Independent.
"I don't know what happened, did he not touch the ball well? It can happen, it is a fraction of a second.
"Maybe the confidence is not at its highest because he has seen a competitor [Aubameyang] coming in for him."
Lacazette has scored only nine goals in 26 Premier League appearances this season since his £55m arrival from Lyon last summer.
Only one of those goals has been scored in the last ten games, a concerning run of form that has coincided with the club record signing of Aubameyang from Borussia Dortmund.
However, Wenger has backed Lacazette to begin scoring again soon.