Paul Pogba and Mario Mandzukic were both on target as Juventus won 2-1 against Lechia Gdansk.
Juve were in front after only four minutes when Paulo Dybala's corner was headed home by Pogba.
But Massimiliano Allegri's men suffered a blow shortly afterwards when Giorgio Chiellini was forced off injured. The Serie A champions have already lost fellow defender Andrea Barzagli to a three-week layoff.
Sami Khedira, signed from Real Madrid earlier in the summer, came off...