The 20-year-old scored his first goal in competitive club games since February against PSV on Tuesday but was disappointed his side could not hold on to the win
The Italy international netted a potentially-invaluable away goal against the Dutch outfit in Eindhoven, heading home Ignazio Abate's cross on 15 minutes.
And although El Shaarawy is disappointed to have not held out for the victory, the 20-year-old admitted he was relieved to find the net for the first time for his club since February.
"It’s only normal that we were behind in terms of match fitness, but we had good concentration and intensity," he told reporters after the match.
"The only regret is that we were unable to hold on for the win.
"It was my first goal in an official match since the derby and it’s also my first header, so it’s very satisfying."
Tim Matavz levelled in the second half for PSV to leave the tie neatly poised ahead of next week's return leg at San Siro.