Crystal Palace have won five of their last seven games.
Sakho has helped Sam Allardyce's team move away from the relegation battle since his arrival.
Eagles boss has also reiterated his interest in signing loanee Mamadou Sakho on full-time basis.
Liverpool will allow Sakho to leave in the summer if interested clubs can meet their £30m asking price.
Sakho has performed admirably since arriving at Selhurst Park.
Merseysiders are reportedly set to demand as much as £30m for player's services.
Eagles boss reveals an 'impossible' bid to turn down would secure Manchester United flop.
Zaha, 24, has more than three years left on his Palace contract.
The France international has been a revelation for the Eagles during six-month loan spell.
France international has been in excellent form since his move south.
Arsenal have suffered four away defeats in the league, conceding three goals on all four occasions.
Under pressure boss admitted the Eagles were 'sharper and more decisive' than his players.
The Gunners thrashed in south east London as discontent among fans grows.
Sakho has been excellent for Crystal Palace in their relegation battle.
Crystal Palace have won three of their last four league games.
Allardyce has no fewer than nine injury concerns ahead of Gunners clash.
Eagles chairman Steve Parish preparing talks over a contract extension at the end of the season.
Tottenham and Leicester also in action during the 3pm kick-offs.
Chelsea are unbeaten in their last 12 games in all competitions.
John Terry is also available after missing the last win over Stoke City.
Former England boss wants chairman Steve Parish to retain the Ivory Coast international.
Zaha, 24, has a contract at Selhurst Park until 2020.