Former Pompey midfielder signs for League One rivals Bristol Rovers
The ex-academy skipper will link up with the under-23 side at the Memorial Stadium.
Widdrington was released by the Blues last month after boss Kenny Jackett decided not to hand him a new deal.
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Hide AdThe 19-year-old was training with Brighton & Hove Albion but has now moved to the Pirates.
Darrell Clarke regards Widdrington as an talent for the future.
The Rovers boss said: 'Theo is an exciting prospect who was released by Portsmouth as they don’t have an under-23 setup.
“Our development squad was created to give players a chance to forge their way into the first-team and Theo will get a chance to impress here.'
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Hide AdWiddrington penned his first professional Pompey contract in July 2017 after graduating through the club's academy.
He spent the first half of last term out on loan at Havant & Waterlooville before returning to PO4 to help ease the Blues' injury problems.
Widdrington featured on the bench four times for Jackett's side but failed to make his first-team debut.