Very easy Trophy to get. You must have PSN online for this Trophy though. From the main menu, scroll right to the "Play" tab. Here, select "Pro Clubs". Your first tab at the top (once you set up you player) should be "Drop-In Match. Click it, pick a side to play on and wait for all the other online players to ready up or the time to go down. Whichever comes first.
Then just pick the position you wish to play, wait for the game to load, and the Trophy should be on its way.
Mine popped as soon as the game kicked off... but I have heard some people needed to stay a few min in the game before the Trophy popped.
Good luck