Pompey fans have been warned to show patience with Erik Huseklepp.
Blues followers have been told they will see the best of the Norwegian forward – if he is given time.
Former Norwegian international Claus Lundekvam has backed Huseklepp to be a hit in England following his £1.5m arrival at Fratton Park.
Lundekvam has been spending time with Huseklepp as he settles into his new surroundings.
He saw the man who celebrates his 27th birthday today have a quiet full debut in the 1-1 draw against Cardiff.
Lundekvam knows it is going to take the forward time to get used to his new surroundings.
But he is certain he will come good if the Fratton faithful stick with him.
Lundekvam said: ‘Erik’s coming to a new country and a new club.
‘He doesn’t know much about league he’s in.
‘It’s going to be a bit nerve-wracking for him. That showed in his performance against Cardiff, really.
‘He didn’t get that much service in the game.
‘He has talent, though, there’s no doubt about that.
‘He has to get used to the physical elements of the league. It is going to take time to adapt.
‘But give him time and Portsmouth fans will see the best of him.’
Meanwhile, Chelsea’s Ryan Bertrand and Aston Villa’s Chris Herd, both linked with Pompey, were named in their teams’ 25-man Premier League squads. Bertrand missed out on Chelsea’s Champions League squad.
However, Michael Tonge – another player linked with Pompey – has been left out of Stoke City’s 25-man squad.