Last week batsman Jamie Dalrymple, director of cricket Matthew Maynard and president Peter Walker all resigned.
Glamorgan manager Matthew Maynard also wants a batsman, with Australian Mark Cosgrove seen as the favourite.
The Australian told BBC Sport Wales that Glamorgan director of cricket Matthew Maynard also wants him back.
Last week batsman Jamie Dalrymple, director of cricket Matthew Maynard and president Peter Walker quit the club.
He followed president Peter Walker, director of cricket Matthew Maynard and Dalrymple who all resigned after South African Petersen was brought in.
While Dalrymple has been replaced as captain, Russell hoped that the player would remain at Glamorgan, along with director of cricket Matthew Maynard.
He will come in to Glamorgan under Metson, whose elevation to his new post saw cricket director Matthew Maynard hand in his resignation.
Glamorgan's heavy defeat to Somerset on Wednesday confirmed that Matthew Maynard's men cannot qualify for the knock-out stages of the potentially lucrative competition.
The 24-year-old has been linked with the Welsh county after Glamorgan cricket manager Matthew Maynard said he wanted to sign a top-order batsman.
"I am absolutely thrilled that Mark is joining the team at the start of a really exciting season, " said Glamorgan cricket manager Matthew Maynard.
"Jamie was signed to Glamorgan due to his experience and strong character which are both key qualities for a captain, " said Glamorgan cricket manager Matthew Maynard.
"I did mention to Matthew Maynard when I played there that he would be someone he should look at some time down the track, " Gillespie told BBC Wales.
"I had a chat with (Glamorgan cricket manager) Matthew Maynard back in August, I had a feeling from that far out that I probably wouldn't be around next season, " Hemp said.
Mr Maynard, the son of former England and Glamorgan batsman Matthew Maynard, earned himself a place on the England Lions tour to Bangladesh and Sri Lanka at the start of last year.
In a statement, the committee said that like Walker it is also disappointed in results on the field, but promised that head coach Matthew Maynard will again have increased funding to build his playing resources.
Dean Gerken's goal-kick was headed on by Marvin Elliott into the path of Maynard, who saw Blackpool keeper Matthew Gilks way off his line and went for glory.
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