Matt Tubbs has revealed his confusion at being sidelined at Pompey.
The striker, 31, penned a loan deal with National League Eastleigh until the end of the season this week.
It brought to an end a period of inactivity at Pompey as he fell out of favour under boss Paul Cook.
Tubbs, who was League Two’s leading marksman last season, scored five goals in 17 appearances for the Blues this term.
Only eight of those matches were starts and Tubbs believes he still had plenty to offer at Fratton Park.
‘Paul Cook told me I don’t suit the Portsmouth system, which is surprising,’ he told BBC Radio Solent.
‘I did my maths and worked out I had played eight games in total minutes on the field and scored five goals.
‘That’s quite a good return for someone who can’t play that system.’
An injury hampered Tubbs’ chances of breaking into the first team frame at Fratton Park.
But despite his return to fitness, the former Bournemouth striker reckons the writing was on the wall.
Now he is determined to spearhead a promotion charge at Eastleigh.
‘The last month has been really frustrating,’ he added.
‘I’ve been fit and there have been times when I was training on my own.
‘I just wanted to play football, whether that was at Portsmouth, at Eastleigh or somewhere else.
‘People say I shouldn’t have dropped down a division but I see this as a club with huge potential, who have a great chance of being in the Football League in a few months.’