The Scout is selecting four overlooked players who could be set for a breakout Gameweek 30 in Fantasy Premier League.
Mahrez made a telling impact off the bench at AFC Bournemouth last weekend.
Having replaced the injured Kevin De Bruyne (£9.7m) at half-time, he scored the only goal at Vitality Stadium.
That strike could secure a starting role against the Hornets in Saturday's late kick-off.
Mahrez can occupy the right-wing role, with Bernardo Silva (£7.5m) moving into central midfield in De Bruyne’s absence.
The Algerian will be hoping to mirror his Gameweek 15 performance against Javi Gracia’s side.
He claimed his season-high haul of 13 points at Vicarage Road, producing a goal and an assist in his 90-minute appearance.
Watford travel to the Etihad Stadium having conceded five goals to Liverpool in their previous road trip.
That points to more joy for Mahrez as City look to consolidate their place at the top of the table.