The designated bowlers, whose identitites have not been confirmed, will have their temperatures checked.
The ECB had planned to introduce 40 professional contracts this summer across eight regional hubs.
County are waiting on a decision.
The Somerset bowler last month opened up about his mental health struggles and he discussed the topic further with Marcus Trescothick on Zoom.
The Australia spinner has previously played at Warwickshire and Middlesex.
The former England batsmen is recovering in the Kent and Canterbury Hospital.
Anderson became the fourth English bowler to reach the milestone when New Zealand opener Peter Fulton nicked into the slip cordon.
It goes down as the most memorable Ashes Series of the modern era and, 15 years on, the 2005 tussle for the ages is still spoken of fondly.