Federici was Royalsâ€™ man of the match as they were knocked out of the FA Cup at Old Trafford on Monday night.
Karacan told the Reading Post: â€śHe got a lot of unfair stick at the start of the season, but he has been unbelievable for us ever since he came to the club.
â€śHe showed against Man United how good he is in this league and in this country. He doesnâ€™t need a pat on the back from us. He knows how he helped keep us in the game at Old Trafford.
â€śFeds deserves all the credit he gets. He is a future Australia No. 1 and Iâ€™m sure he will go on to better things.â€ť