Tyler Walker had only met his new team-mates a few hours before kick-off at Plough Lane.
The striker had trained with parent club Coventry on Monday morning before signing the paperwork for a loan switch to Pompey remotely.
But he wanted handed his debut from the start against AFC Wimbledon, partnering fellow loanee George Hirst up front.
He had one shot smartly saved by Nik Tzanev, as the Blues were frustrated by their hosts to ensure the game finished goalless.
Walker said: “I really enjoyed it and I’m just gutted that we couldn’t come away with all three points, but we’ll move on from this and go again on Saturday.
“I’m really happy to be here, though, and looking to push on and try to help this club secure promotion.
"I really enjoyed it and I’m just gutted that we couldn’t come away with all three points."
“It was straight in and I’ve enjoyed the start, so now I’m looking forward to getting properly up and running.
“I travelled down after training with Coventry on Monday, so it’s all been really quick, but now can concentrate on my football.
“I literally met everyone when we linked up ahead of the game, but all the lads have been really good to me.
“We were definitely better in the second half and gave it a real go – it’s just about getting those connections going.
“I’m confident that things will start dropping for us soon and that I can score the goals I was brought here for.”
Walker and his fellow forward Hirst have an interesting connection, with their fathers – Des and David respectively – starring together for Sheffield Wednesday in the 1990s.
“I know Hirsty really well and we’ve been away on holiday together, so he’s a good mate of mine,” said the Coventry loanee. “It’s nice to come into a club and knew a few of the lads.”