Suarez made it 2-0 for Liverpool but the goal triggered accusations of cheating after replays suggested he had used his hand.
London: Daniel Sturridge scored on his Liverpool debut and Luis Suarez caused controversy as the seven-times winners beat minor league Mansfield Town 2-1 to reach the FA Cup fourth round on Sunday.
Sturridge, signed from European champions Chelsea, took just seven minutes to open his account on a rutted Mansfield pitch that looked more like a mudfield in places.
Suarez, who replaced the England striker in the 55th minute, made it 2-0 after just four minutes on the pitch but the goal triggered accusations of cheating after television replays suggested he had used his hand.
Neutrals hoping for an upset, in a David and Goliath clash encapsulating the magic of the world's oldest knockout competition, were given hope when Matt Green pulled one back for the Stags in the 79th and Liverpool faltered.
The game ended with Liverpool under pressure, Green having a shot turned away in stoppage time and Exodus Geohaghon rattling the visitors with his immense throw-ins.