The warm-up games help them prepare for the big kick-off, which this season is August 5.
They also help clubs look at potential signings, with side’s more often welcoming triallists into their ranks in order to have a closer look at them.
But while the Blues haven’t gone down that route yet under John Mousinho, others in the division have.
Here’s who’s looking at bolstering their ranks with some unattached bargains and the results they’ve picked up so far this summer.
. SHEFFIELD, ENGLAND - FEBRUARY 20: A general view of the EFL logo on the match ball during the Sky Bet Championship match between Sheffield Wednesday and Birmingham City at Hillsborough Stadium on February 20, 2021 in Sheffield, England. Sporting stadiums around the UK remain under strict restrictions due to the Coronavirus Pandemic as Government social distancing laws prohibit fans inside venues resulting in games being played behind closed doors. (Photo by Michael Regan/Getty Images)
League One clubs are finalising their plans for the new season Picture: Michael Regan/Getty Images Photo: Michael Regan
. Barnsley
Games played: W 2-0 v AFC Fylde (game abandoned after 60 mins); W 2-1 v Worksop. Triallists used: 0 Photo: George Wood
. Bolton Wanderers
Games played: W 1-0 v Bamber Bridge, W 3-1 v Curzon Ashton. Triallists used: 0. Photo: Michael Steele
. Bristol Rovers
Games played: W 9-0 v Melksham Town; W 2-0 v Eastleigh; L 2-1 Cardiff (on aggregate, with two 60-minute games played). Triallists used: 1 (Teo Kurtaran). Photo: Dan Mullan
. Burton Albion
Games played: L 1-0 v Burnley, D 1-1 Nuneaton Borough, W 4-1 v Alfreton Town. Triallists used: 7 (v Nuneaton) and 4 (v Alfreton). Names unknown. Photo: Michael Steele
. Cambridge United
Games played: D 1-1 v Cardiff, result unknown v Spurs U21s behind closed doors. Triallists used: 0. Photo: Nathan Stirk
. Carlisle United
Games played: W 2-1 v Annan Athletic, W 7-0 v Gretna 2008. Triallists used: Dan Langley and Stephen Walker in both games. Photo: Charlotte Tattersall
. Charlton Athletic
Games played: W 4-0 v Welling United, W 2-1 v Dartford, D 1-1 v Leyton Orient. Triallists used: 1 (v Welling - Chris Francis), 1 (v Leyton Orient - goalkeeper, unknown). Photo: George Wood
. Cheltenham
Games played: W 4-2 v Evesham, W 6-0 v Swindon Supermarine Triallists used: 1 (Liam Smith v Swindon Supermarine). Photo: Steve Welsh
1. SHEFFIELD, ENGLAND - FEBRUARY 20: A general view of the EFL logo on the match ball during the Sky Bet Championship match between Sheffield Wednesday and Birmingham City at Hillsborough Stadium on February 20, 2021 in Sheffield, England. Sporting stadiums around the UK remain under strict restrictions due to the Coronavirus Pandemic as Government social distancing laws prohibit fans inside venues resulting in games being played behind closed doors. (Photo by Michael Regan/Getty Images)
League One clubs are finalising their plans for the new season Picture: Michael Regan/Getty Images Photo: Michael Regan
2. Barnsley
Games played: W 2-0 v AFC Fylde (game abandoned after 60 mins); W 2-1 v Worksop. Triallists used: 0 Photo: George Wood
4. Bolton Wanderers
Games played: W 1-0 v Bamber Bridge, W 3-1 v Curzon Ashton. Triallists used: 0. Photo: Michael Steele