vs Viola he had 0.4 xGoal stat, which is already 6.7 npxG stat (expected goals with out penalties) for the whole campaign. He has scored 3 goals out of it, so he is 3.7 goals below his xGoal stats. That is the worst conversion rate in the league, comparable only to Roberto Piccoli (scored 3 goals out of out of 5.8 npxG, - 2.8 goals) and Nikola Krstovic ( 3 goals out of 4.9 npxG, - 1.9 goals.
At the same time, he has pretty good conversion in the CL, with his npxG as low as 1.8 he has scored 3 goals not counting penalties, which means he is 1.2 on plus and this is one of the better conversion rate for the strikers in the competition.
Why do we see such a big difference in both competitions?