The Liverpool pair are in contention for the prize after helping the team to seven successive victories during the period.
Salah started six of the seven games for the Reds and scored six goals, including a hat-trick at Bournemouth and the opener at Wolverhampton Wanderers.
Van Dijk, meanwhile, began every match as Liverpool recorded four clean sheets, and the Dutchman netted his first league goal for the club in the win over Wolves.
The Reds duo are up against five other players for the award: Felipe Anderson (West Ham United), Eden Hazard (Chelsea), Harry Kane (Tottenham Hotspur), Marcus Rashford (Manchester United) and Son Heung-min (Tottenham Hotspur).