Christian Dailly has been backed to become a key Fratton performer by David Norris.
The 37-year-old penned an initial one-month deal at the end of last week.
Steve Cotterill has indicated he could remain until the end of the season if he impresses.
Dailly made his first start in the Carling Cup embarrassment against Barnet on Tuesday night.
It was an underwhelming introduction to Fratton Park in a poor team performance.
However, the former Blackburn and Charlton man showed his versatility by operating as firstly a central midfielder and then a left-back.
Team-mate Norris has clearly been impressed since the veteran’s arrival on the south coast.
And the midfielder reckons he is a useful acquisition.
Norris said: ‘Christian has come in and looked sharp.
‘He is 37 but he’s a machine.
‘He can get about, he’s fit and looked sharp on the ball in training.
‘I think he will be a good addition, particularly with an experienced head as well.
‘People say he’s 37 but he’s a different 37.
‘He plays more like a 28-year-old.
‘Christian can play in defence and in midfield and will be fine.
‘I think he will be a good addition to the squad.’
Dailly’s arrival has been a timely one as Pompey continue to search for new additions.
He failed to agree terms over a new Charlton deal and last week arrived at the Wellington Sports Ground for training.
Cotterill has long been an admirer of Dailly, who has also played for Derby County, and snapped him up within days of his arrival.
Dailly was one of three substitutes in the Championship clash Middlesbrough – the opening match of Pompey’s season.
It was his blocked shot which helped create the opportunity for Luke Varney to grab a last-gasp leveller and earn the Blues an opening-day point.
Dailly has made 659 appearances and scored 36 goals so far in a 21-year career.
He arrived at Fratton Park having been a regular in the centre of defence for Charlton over the past two years.