Arsenal manager Mikel Arteta admits midfielder Mohamed Elneny is working hard to add goals to his game.
The all action Egyptian has not always been in favour at the Gunners.
However, he is grabbing his chances this season, scoring a vital third goal as Arsenal won 3-1 away from home in the Europa League.
The Gunners bested Olympiacos in the round of 16 first leg on Thursday.
Asked about Elneny's goal and its importance, Arteta said: "I don't know, there is still another game to play in this competition and with this level of opponent, anything can happen.
"So we have to be very prepared to take the game nil-nil and go and win it at the Emirates. Then we will be through.
"With Mo in particular and with the subs, I'm extremely delighted because I know how much they want to play and they are key in this competition. If you want to be successful, you need your subs to make an impact and they've done it tonight again.
"And Mo in particular, because of how he's been training so hard to improve his shooting range with Roundy [Steve Round] and he got his reward tonight. It's very important for the team."
