Tottenham Hotspur will face Sunderland at White Hart Lane in the Premier League on Saturday afternoon.
Dietmar Hamann wants Liverpool duo Roberto Firmino and Christian Benteke to do more.
Liverpool will let Adam Bogdan leave, if there is interest.
The Brazilian bagged two goals in the recent 3-3 draw.
Liverpool will face Manchester United at Anfield in the Premier League on Sunday afternoon.
The midfielder recently scored in the 3-3 draw with Liverpool.
The Juventus star has been linked with a number of Europe's elite clubs.
The former striker, who played for both clubs, has been previewing the Reds' Premier League clash against Man United on Sunday.
The West Ham playmaker is in an understandably good mood.
Tottenham are reportedly targeting a host of strikers.