Simpson, 35, joined Sussex from Middlesex and will take over from Cheteshwar Pujara, who is set to return as an overseas player for the beginning of the Championship season.
“John is going to do the first seven games,” said Paul Farbrace, Sussex’s head coach. “He wants to make sure that he is absolutely the right person to be captain. There’s a natural break after seven games in the Championship, so that fits really nicely.”
Mills, 31, recently signed a new contract and will take on the T20 captaincy role after the departure of Ravi Bopara. “Ty worked extremely closely with Ravi last year, he’s full of experience,” Farbrace said. “There is a chance that he will be selected to play for England, if he is, we will reassess that situation.”
“I think they’re two excellent choices,” Farbrace added. “They’re two people with a vast amount of experience and knowledge and they’ve also got a lot of respect within our club, within our dressing room, and people really want to play for them.”
Farbrace also suggested that both players “being around the club” during the off-season would help build relationships with the squad and coaches. “I didn’t join until the end of February last year so we had a short run-in to the start of the season, and perhaps it was a little bit ‘This is how we do things, let’s crack on with it’. Whereas now we’ve got a little bit more time, and we’ve had more time since the end of the season, to be more collaborative, more open, a lot more planning and involve a lot more people in discussions for the way forward.”
A decision on whether Tom Haines would continue as captain in the One-Day Cup would be taken closer to the start of the season, with the player currently away on England Lions duty.