Tony Mowbray has bemoaned Middlesbrough’s defensive naivity as they surrendered two points against Pompey on Saturday.
Boro were closing in on an opening-day triumph as they led 2-1 going into injury-time at the Riverside.
But Luke Varney’s last-gasp leveller left the home boss frustrated.
‘Ultimately, I’m very frustrated and disappointed,’ said Mowbray.
‘From my point of view, you’ve got to see the game out and it should have been won.’
Despite his disappointment, Mowbray praised Pompey’s never-say-side spirit.
And he has called on his Boro troops to put the defeat firmly behind them with victory over rivals Leeds United.
‘Credit to Portsmouth for keeping going, they’re a big strong, powerful team.
‘We were probably a bit naive for the second goal.
‘It was a ricochet and when it fell for the boy he stuck it into the net. That’s football.
‘A slight lack of concentration and lack of discipline has cost us.
‘But we go again next week – with a nice, quiet game at Leeds!’