League One rivals who have utilised triallists this pre-season and those who haven't - including Portsmouth, Barnsley and Charlton: gallery

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.