You base your opinion on a couple of numbers. As for his overall contribution he has been shit this season, rather disappointing transfer for that amount of money? Maybe he scored those 4 goals (which is not a lot) but he had like one good match and don't forget how attacking Roma is, especially with Zeman around. Had it been Osvaldo, it'd be like 15 goals for now, because he missed like tons of chances. To sum it up, he doesn't add almost anything to their team. I expected much more, at one point I even wanted him at Juve because I thought he's promising. But now, no way I'd even consider him, no thanks.
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It's not today, it's every match.