With consequences looming on the San Siro Sanchez poked home from close variety in the 121st minute of a gruelling contest handy Simone Inzaghi his first trophy for the reason that arriving at Inter to replace Antonio Conte inside the summer time.
Chile ahead Sanchez was submerged by celebrating teammates as he charged to the sidelines to rejoice his winner, which got here after Lautaro Martinez's first-1/2 penalty had levelled Weston McKennie's opener for Juve.
The win maintains Inter's sparkling shape, with eight wins from their last 8 matches in Serie A, which they lead by means of a point from town opponents AC Milan.
For Juve meanwhile it became any other sadness in a season which had regarded adore it become getting on the right track in recent months after an inconsistent opening.
Martinez could have put Inter in advance inside eight minutes while absolutely unmarked he somehow didn't meet Stefan De Vrij's header from a nook, and seconds later flashed a primary-time attempt wide whilst laid on by way of Nicolo Barella.
McKennie silenced the Inter lovers within the twenty fifth minute while after Alvaro Morata accrued on the edge of the vicinity the Spain ahead clipped over a go which was deflected immediately into his American teammate's direction.
However Inter were stage 10 minutes later thanks to Martinez, who rifled domestic a precision spot-kick after Edin Dzeko became taken out by Mattia De Sciglio.
Juve commenced the second half with their tails up however other than efforts from Federico Bernardeschi it changed into Inter who had been the dominant team after the destroy.
They had the exceptional danger to interrupt the impasse in ordinary time whilst Mattia Perin pushed Denzel Dumfries' close-variety header onto the bar simply earlier than the hour mark however struggled to create a whole lot more chance in spite of being actually the higher team.
