The Pompey striker has told how a back niggle led to him reducing his participation in his side’s warm-up games as they gear up for the play-offs.
But Harrison explained that decision was purely precautionary - and he’s firing on all cylinders going into Friday’s showdown at Fratton Park.
The 26-year-old was limited to 45 minute and 30-minute outings in the warm-up games against Reading and Brentford.
Portsmouth transfer news: Blues receive bids for former Luton and Millwall midfielder
Transfer gossip: Portsmouth eye raids for ex-Chelsea man and Charlton Athletic's former Wigan Athletic midfielder
'Is proving one hell of a signing.... A real livewire' - Portsmouth match ratings from 2-0 win at Cheltenham
Former Portsmouth pair help Ipswich flex muscle as Norwich City man is slammed for conduct in Peterborough's Plymouth Argyle reverse
Cheltenham boss Wade Elliott praises experienced Portsmouth in 2-0 defeat at Whaddon Road
Harrison did miss the FA Cup trip to Harrogate in a back strain in November, before returning against Rochdale the following game.
The summer arrival from Ipswich was fully involved in the in-house friendly last week and is feeling sharp and ready for what lies ahead against Karl Robinson’s side.
And he’s keen to keep up a strong record in his maiden campaign under Kenny Jackett after 36 appearances and 10 goals.
Harrison said: ‘I had a 45 and a 30 before the game we had on Friday.
‘I had a little bit of pain in my back. It wasn’t enough to be worrying, but it was just being cautious. I’m fully fit now and raring to go.’
A message from the Editor
Thank you for reading this story on portsmouth.co.uk. While I have your attention, I also have an important request to make of you.
With the coronavirus lockdown having a major impact on many of our advertisers - and consequently the revenue we receive - we are more reliant than ever on you taking out a digital subscription.
Subscribe to portsmouth.co.uk and enjoy unlimited access to local news and information online and on our app. With a digital subscription, you can read more than 5 articles, see fewer ads, enjoy faster load times, and get access to exclusive newsletters and content. Visit our Subscription page now to sign up.
Our journalism costs money and we rely on advertising, print and digital revenues to help to support them. By supporting us, we are able to support you in providing trusted, fact-checked content for thiswebsite.