On Thursday night Saints face a team sitting top of the Norwegian league after 16 games while they themselves have only had two friendly matches, both 1-0 wins against Cowdenbeath and Morton.
But Wright does not want to hear any of his players focusing on negatives ahead of the first leg of the second qualifying round.
"We have just concentrated on what we can affect and we can get the players as fit as possible in the time frame that we've got," Wright said.
"We finished a long, hard season, they needed recovery. We brought them back in as early as we could and they have worked extremely hard.
"We have concentrated on what we have been able to do and stayed focused and created a positive atmosphere and had no negativity. We don't want to be making excuses."
Wright called on his team to be ruthless in front of goal and disciplined at the back as he is convinced they will create chances against Rosenborg, who beat Northern Ireland's Crusaders 9-3 on aggregate in the first round.
"They play good football but they probably haven't been firing on all cylinders recently, even though they have been getting results," Wright said.
"They do give you opportunities. In all the games I've seen, and the games I've seen on DVDs, teams get opportunities against them.
"It's important we stay in the game, remain disciplined and give ourselves a platform, because I do think we'll get chances to score goals."