Goalkeeper Simon Eastwood has joined Pompey on non-contract terms.
His signing makes the 23-year-old eligible to play in tomorrow night’s Capital One Cup game at Plymouth Argyle.
The former Huddersfield, Bradford and Halifax keeper has been training with the Blues since the start of July.
Eastwood was among a group of triallists who travelled to Spain for the club’s pre-season training camp, featuring in the 4-0 defeat at the hands of Gibraltar.
He also played in the wins over Bolton and AFC Wimbledon.