The Lions will come to the Lamex on July 19
Stevenage are to host Championship side Millwall in a pre-season friendly.
The Lions, managed by former Crystal Palace and Blackpool boss Ian Holloway, will visit the Lamex on Saturday, July 19 for a 3pm kick-off.
Boro were originally due to host Watford on that day, but their pre-season friendly with the Hornets was cancelled after the two sides were drawn against each other in the Capital One Cup.
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