He struggled with his positioning and was pulled in the 55th minute and replaced by Spaniard Albert Riera, who was a surprise choice to play there by Merrick given Manny Muscat's ability to fill the role.
Merrick argued after the game that he didn't want to break up his midfield triumvirate of Muscat, Carlos Hernandez and Vince Lia so he left Muscat in his holding midfield role.
Next weekend, the Phoenix travel to Western Sydney to meet the Wanderers, and picking a right back will be one of Merrick's major sticking points in the build-up.
The Scotsman said Fenton was a realistic prospect to be fit for the home-away-from-home outing against Newcastle in Napier on Labour weekend, meaning he would have to find a stop-gap option for next week.
Muscat is the club's most proven right back but he prefers to play in the midfield and looked solid there yesterday.
The return of Durante to central defence could allow Michael Boxall to shift out to the flank as he was solid against the Roar.
"I personally am going to operate on Louis Fenton to make sure his dislocated shoulder is perfect," Merrick joked after the game.
Against Brisbane, the Phoenix went ahead midway through the first half when former Belgian international Stein Huysegems finished from close range as Wellington took a 1-0 lead to the break.
Brisbane began the second spell in perfect fashion, though, when a Roar attack down the Phoenix's right flank saw Besart Berisha score inside the opening minute as poor marking left the Albanian open at the top of the box.
During the middle stages of the final 45 minutes, both sides had their chances to find a winner and the visitors left it as late as possible when Franjic hammered home a loose ball that had rattled off the post from a Thomas Broich shot.
Brisbane's attack that led to their final goal came via the Phoenix's right side of the paddock.
Brisbane Roar 2 (Besart Berisha 46, Ivan Franjic 90+1)
Wellington Phoenix 1 (Stein Huysegems 21) Halftime: 0-1