Adam McGurk has completed a move to Cambridge United.
The forward agreed a deal to leave Pompey before penning a two-year contract with their League Two rivals.
McGurk, 27, had been transfer listed by boss Paul Cook, who deemed him surplus to requirements at Fratton Park.
The Northern Irishman scored six goals in 36 games for Pompey last season.
Kal Naismith and Matt Tubbs were also transfer listed this summer, with the latter recently completing a move to Forest Green Rovers.