Darmian scored his first goal for Man United at Old Trafford with a left-footed shot in the second half.
The strike came after the Italian had earlier forced Damien Delaney’s own goal. Smalling was pleased with his teammates contribution following the match:
Darmian had been disappointing in recent weeks and he would have been happy to get back on track.
The 26-year-old enjoyed a sparkling start to his United career but his form has dipped due to a combination of injuries and being moved around the back four.
His performance against Palace will give Louis van Gaal a headache when it comes to his team selection for the FA Cup semi-final clash against Everton on Saturday, with Marcos Rojo and Timothy Fosu-Mensah also in contention to start at Wembley.