The Argentina captain featured in the scratchy 1-0 win.
Mascherano said: "It was a difficult game because Zaragoza put a lot of men back in defence. In the end, we went on and stretched our lead at the top ahead of Sunday's game, now we can think ahead to Tuesday when we have a very important match.
"The boss decided to rest some players and it worked out okay with the win. Now, there will be players who are fresher on Tuesday."