The Reds have spent big money improving this summer, but Parlour still has a doubt.
The 23-year-old arrived from Oxford United after a goal-laden season in League Two.
Sunderland could bring in a number of new players in the weeks ahead.
The US Under-23 international midfielder got his first extended taste of senior football on loan at Rangers last season.
Serie A side Lazio are keen on the Frenchman's signature.
Valencia has rapidly fallen out of favour at the Hammers under Slaven Bilic and looks set to complete his exit.
The Reds have spent heavily on improving their forward options this summer.
The Tottenham Hotspur boss will not be bringing in any more central defenders this summer.
Warburton has been a hit at Ibrox since taking charge last season.
Leeds United have been linked with some interesting targets in recent days.
The first inkling I had that I was going to lose my job was when my boss at UBS in New York suggested we go off the desk for a coffee.
The Hull City player has been linked with a move to Tottenham Hotspur.
Sunderland youngster scored again this week.
Arsenal youngster is impressing at Charlton.
Celtic are reportedly pursuing Southampton's Ross Wilson again.
Here is how we predict Leeds United and Sheffield Wednesday will line up this weekend:
West Ham were linked with Hull City ace late in the transfer window.
Mark Wotte has suggested he would like to become Rangers' new Director of Football.
The Leeds United player has barely featured but have his replacements really done any better?
Aston Villa have reportedly taken giant defender Chris Samba on trial.
Deutsche Bank said second-quarter revenue dropped at its prime finance unit, extending a slump beyond businesses that the lender is seeking to exit as client concerns added to volatile markets.
Crude oil prices will remain in the $45-$50-a-barrel range till mid-2017, with little to change the global supply and demand situation, Goldman Sachs said.
Sam Allardyce has suffered his first setback as England’s new manager after Bayern Munich blocked the Football Association’s attempt to make Paul Clement part of the new regime.