Here's my player Raheem Sterling

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He joined us 3 seasons ago. This was his second complete season ( yes he had played a few games in the season he was acquired. Like 5-8 matches but he has completed only 2 seasons).

He will get +30% finishing attribute this season and has good goal rate. He looks like a great player to invest many rests (i just think so). He scored less number of goals this season (don't know why) than previous season. Last season he scored around 45 goals in the league alone.

Can you please guide me whether should I use my greens?
Can he become a legend?