The Brazilian moved to Anfield during the January transfer window, making his debut against West Bromwich Albion last month.
The Reds assistant manager told Liverpoolfc.com: "Philippe has been brilliant. I'm not surprised by his impact so far as we knew how good a player he was. He's got a good eye, he's got a good awareness of where his teammates are and that's what he's picked up very quickly.
"He got two assists at Wigan. The one he crossed for Stewart Downing's goal with two wingers combining was fantastic, and his goal against Swansea was superb.
"He wants to get into the box and he wants to score goals. If the opportunity is there for a pass he will make the right decision whether to shoot or pass and that's the sign of a good player."
Liverpool face Tottenham Hotspur on Sunday.