Arsenal captain Granit Xhaka is convinced by the potential of Switzerland teammate Denis Zakaria.
Tottenham, Manchester United and Inter Milan are all watching the Borussia Monchengladbach midfielder, says BILD.
And former Gladbach star Xhaka says: "He is developing enormously.
"With Denis next to me, I always feel a lot more secure in the national team of Switzerland."
Xhaka adds: "He should not float away now, a crucial phase is now dawning for him."
