The Rossoneri started with Robinho and Giampaolo Pazzini in attack and drew 1-1 with their opponents, a result which keeps them third, four points behind Napoli in second place.
“It was a decision taken by the coach and I fully respect it, like I have always respected substitutions in the past,” he told the Milan Channel.
“He has given me lots of confidence and shown a lot of belief in me, so there is no problem whatsoever. I respect his choices and, in the game against Napoli, he preferred to start with Robinho.
“There is no problem between the coach and I, we have a good relationship and we always have had. I am relaxed, I have done well until now and I just want to keep improving.”
The Italy international added his goalscoring has been affected by the arrival of Mario Balotelli from Manchester City.
“The arrival of Mario Balotelli hasn't changed things that much. As a team we still create chances, but I am a little less clinical in front of goal but that is because I sacrifice myself for the team.
“I am happy with what I have done over the last few months and I want to help the team as much as possible.”
El Shaarawy has scored 16 goals in 30 Serie A matches this season.