As the Championship promotion race heads towards a thrilling finale, leaders Middlesbrough visit fourth-placed Watford in Monday's early kick-off.
Just two points separate the top four sides in the second tier, meaning Watford - who were top as few as two games ago - could temporarily climb back to the summit should they claim all three points at Vicarage Road.
Brentford and Derby County are currently filling the last two berths, the former welcoming Nottingham Forest while Steve McClaren's Derby are desperate to end a seven-match winless run when they go to second-bottom Wigan Athletic.
At the bottom, Blackpool's relegation will be confirmed if they lose to Reading, or if Rotherham United defeat Brighton and Hove Albion.
At the wrong end of the division, just four points separate Port Vale in 15th and Crawley Town in 22nd.
Johnson's men are two points behind Tranmere Rovers, who host out-of-form Luton Town, and three adrift of Hartlepool United, who welcome Southend United after having a four-game winning run snapped at Newport County on Friday.
Carlisle United can still be reeled in but will hope to add daylight between them and the three teams below them at Accrington Stanley.
