Bayer Leverkusen midfielder Granit Xhaka has praised his Nigerians teammates Victor Boniface and Nathan Tella for what they bring to the club. At the weekend Leverkusen were crowned Bundesliga champions for the first time in their history after thrashing Werder Bremen 5-0. Boniface opened the scoring and also set up Xhaka for the second goal. Tella was also in action against Bremen as he was…