The 25-year-old left-arm seamer, who left Sussex at the end of the season, will also be available for selection in red-ball cricket on a match-by-match basis.
After making his international debut in 2015, Topley went on to play 10 ODIs and 6 T20Is, including two at the 2016 World Cup at which England were runners-up. His international career was then curtailed by injury and back surgery after five stress fractures. He has since neared a return to the fold, playing four 50-over matches for England Lions in 2018 in a triangular series with West Indies A and India A.
An impressive Vitality Blast campaign at Hove in 2019 saw Topley discussed as a potential international cricketer once more.
2020 proved an exciting first year at The Kia Oval for Topley, leading Surrey’s charge to the Vitality Blast final and making his first senior international appearance for more than four years.