Jack Whatmough is taking closer scrutiny in his body as he bids to avoid any further set-backs.
The central defender was an impressive presence once again as Pompey won 3-1 at Rochdale on Saturday.
It represented a return to the team following four matches sidelined by a hamstring injury.
Whatmough had started the campaign strongly, establishing himself ahead of Christian Burgess to partner Matt Clarke in defence.
Now he’s reclaimed his spot – and hoping to avoid any more injury bumps during the season’s progress.
Ahead of tonight’s Coventry clash, he said: ‘I had a few weeks out with my hamstring. The timing could have been a bit quicker but I fell ill, so my recovery was delayed a little bit.
‘I don’t know whether it was food poisoning or a virus, I couldn’t really work it out, but I had to stay away from training for 24 hours post-symptom so I didn’t pass it on.
‘My injuries have been big ones and then I got the muscle injury at the end of last year, which I was bound to pick up after being out so long to then play nine consecutive games.
‘This one (hamstring) was just a little one, nothing too major.
‘But I'm in that situation where if I’m feeling something I cannot just go through it because it can lead to something more, which I've seen in the past.
‘So I have to be a bit more careful within myself and monitor what I am doing a bit more – but I’m feeling good and feeling fit.’