Mauricio Pochettino's men have challenged for the Premier League title this season, but Redknapp fears they may struggle to hold onto their best players.
The 36-year-old Bulgarian is eyeing a comeback with his former club three years after a grueling battle with leukaemia forced him to retire.
Lallana and Klopp seem optimistic at Liverpool's chances of turning around one-goal deficit from first leg.
Stoke have been in pretty form of late, and face Sunderland this weekend.
The former Toffees goalkeeper has criticised Bill Kenwright and co.
The club are yet to appoint a new manager following the sacking of Remi Garde.
Is it time for Arsenal to identify replacements for Arsene Wenger?
The two sides meet at the Emirates on Saturday, with both in desperate need of all three points.
The 18-year-old has become a regular for the Scottish Premiership side.
Sunderland currently sit just one place above the relegation zone, ahead of Norwich City on goal difference.