Leeds are set to take on the League Two side in a pre-season friendly next week, and Blackman is expected to arrive in time for that match.
The Chelsea goalkeeper is set to join Leeds on a season-long loan, and is widely anticipated to be Bielsa’s number one for the new campaign.
Leeds have already offloaded Felix Wiedwald and Andy Lonergan this summer, leaving Bailey Peacock-Farrell as their only senior goalkeeper.
Peacock-Farrell impressed towards the back end of last season, but it is thought that Blackman will come in to replace him.
The Chelsea stopper has experience of playing regularly in the Championship, after a loan spell with Sheffield United last term.
Blackman will become Leeds’ second signing of the summer, following the addition of Lewis Baker on Chelsea.