Goals and assists are probably not the most relevant stats. I don't much about this player but my sense he is a defensive midfielder in the Marchisio mold. Not in the Pjanic / Pogba mold. You would have to look at pass completions, chances created, takles won etc.
I understand but compared to Pogba who also is considered as a defensive midfielder,
52 Games, 10 goals, 12 assists..
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Erm, he plays defensive midfield!!!!
Tackles, interceptions, forward pass %, aerial wins, yellow red cards, and maybe chances created.
This are Witsel statistics from Russian league season 2014/2015
Shot Accuracy: 44%%
Av. Pass Accuracy: 88%
Avg. Defensive Actions: 3
Total appearances: 28
Avg Pass Length: 16 m
Total chances created: 19
Total goals Scored: 4
Avg duels won: 54%
Yellow cards: 5
This are Pogba statistics from Serie A season 2015/2016
Shot Accuracy: 37%
Av. Pass Accuracy: 83%
Avg. Defensive Actions: 2
Total appearances: 35
Avg Pass Length: 17 m
Total chances created: 54
Total goals Scored: 8
Avg duels won: 51%
Yellow cards: 10