The Argentine international helped us keep a clean sheet against United’s array of attacking talent before testing David De Gea himself as we pushed for victory in the final half-hour.
United created chances but a combination of Hugo Lloris, indifferent finishing and determined defensive play kept them at bay.
At the other end, De Gea was forced into saves by Federico, Andros Townsend and Christian Eriksen before Ryan Mason fired inches over.
“It was our second game in two days but we finished strongly in the second half,” said Federico, who made his 10th start in the Premier League.
“We kept our line high, pressed more and tried to score the one goal to take the three points.
“We fought all the way and we have to keep this intensity, keep this belief and stay compact (defensively) like this. This attitude is important.”