Dyson, 19, has joined from Everton after impressing on-loan earlier on this season for Neil Young’s Stockport County.
The young forward will go straight into the squad for tonight’s game against Kidderminster Harriers.
Chester manager Steve Burr said: “Callum’s a young lad that has been at Everton for a long time, and he did very well earlier on this season at Stockport County.”