Romelu Lukaku was on target, but Inter suffered a heavy 4-2 defeat to Villarreal in a pre-season friendly that showed a serious weakness in conceding counter-attacks.
Simone Inzaghi had to do without injured Marcelo Brozovic and his absence was keenly felt in midfield, replaced by new signing Kristjan Asllani.
Played at the Stadio Adriatico in Pescara, Villarreal took the lead when Alfonso Pedraza was left totally unmarked for a fine volley off the outside of the boot.
Lukaku equalised by nodding in the Robin Gosens cross, aided by a shaky Geronimo Rulli attempt to flap it away, but Francis Coquelin restored the advantage after Asllani gave the ball away cheaply.
Villarreal went 3-1 up, as Pedraza got away from Milan Skriniar and his cross-shot surprised Samir Handanovic at the dawn of the second half.
Handanovic did better on Alex Baena’s header, and Danilo D’Ambrosio got another back by nodding in a Federico Dimarco cross.
Nicolas Jackson completed the rout on another counter-attack, this time sparked by a Tucu Correa mistake.
Inter 2-4 Villarreal
Pedraza 29, 48 (V), Lukaku 36 (I), Coquelin 43 (V), D’Ambrosio 66 (I), Jackson 81 (V)
Inter: Handanovic; Skriniar (D’Ambrosio 62),De Vrij, Bastoni (Darmian 54); Dumfries (Bellanova 62), Barella (Gagliardini 69), Asllani, Calhanoglu (Mkhitaryan 54), Gosens (Dimarco 54); Lukaku (Dzeko 69), Lautaro Martinez (Correa 69)
Villarreal: Rulli; Foyth, Albiol (Mandi 70), Pau Torres (Cuenca 70), A Pedraza (Estupinan 61); Coquelin (Morales 61), Capoue, Dani Parejo; Yeremy (Chukwueze 61), Álex Baena (Morlanes 79), N Jackson