Danny Cowley oversaw training at Portsmouth for the first time on Friday morning, Football Insider understands.
He has yet to be officially appointed by the League One big hitters.
But a source has told Football Insider Cowley and his brother Nicky have agreed the terms of short-term contracts running until the end of the season.
Those deals include huge bonuses if Portsmouth get promoted.
The Cowleys had to submit negative Covid-19 tests before being allowed to enter the Portsmouth ‘bubble’.
This site revealed on Wednesday that Cowley was set to take over at Fratton Park after arriving for talks that afternoon.
The appointment is seen as a huge coup with the pair having five promotions under their belt as well as keeping Huddersfield in the Championship last term.
They left the Terriers with one game remaining of last season and have been out of work since.
Pompey have been managerless since Kenny Jackett was sacked following their Papa John’s Trophy final defeat to League Two outfit Salford City last weekend.
The promotion chasers lost 1-0 to Peterborough on Tuesday night making it four consecutive defeats in the league.
They now sit in 10th, three points behind the play-off positions, with just one win in their last eight League One fixtures.
With 12 games left Portsmouth are well placed to launch a promotion bid and have games in hand over half of the teams in the top six.