Friend added that McClennan should still be involved, with a partnership the ideal solution. "If they work in tandem I'm sure we'll be heading in the right direction for next year.''
The Warriors looked on course to break their losing streak against the Panthers before yet another defensive blunder allowed Travis Robinson to score a converted try three minutes from time for the victory.
"I don't think our attack is lacking,'' said 31-year-old Friend, who joined the Warriors at the start of the season after stints in the NRL with Brisbane, Melbourne and the Gold Coast.
"We've just got to tighten up or find a defensive structure that suits the guys over here and their style. We've got a little while to work on that now. Everyone needs to know what their role is. Once we can do that under fatigue through the off-season, come game time we'll be much better prepared for next year.''
Friend's shoulder injury will spare him the final two matches of the season against the Dragons in Wollongong and Raiders in Auckland - regardless of whether he needs surgery or not.
He said he had no regrets about moving from the Titans, despite the fact that his former club remain in the mix for the playoffs, whereas the Warriors, grand finalists last year, are fighting to avoid the wooden spoon.
Adding to his frustrating year is the fact that his season-ending injury follows an earlier broken jaw.
"I guess that's why they say the life of a footballer might only be three or four years because anything can happen. I was fortunate that I did only miss five games with my broken jaw and when I came back I thought I'd finish out the season ... but I guess you have to look at the positives. If I do have to have surgery I'll be back for round one that's for sure.
"Personally it's been a great experience for me. I'm glad I made the move. We've all had a season together now and I'm looking forward to a good off-season with the guys ... and try to rectify where we're falling down at the moment.''