"If we get that right, it will work well for us."
Bonevacia, who arrived in Wellington from Dutch side Roda JC, has been one of the Phoenix's best this season but still slips in to his defensive habits of old where he drops back too far on the field. Merrick has worked on trying to ensure the 23-year-old continues to get involved and push forward to create havoc for the opposition.
Wellington have a range of potential goal-scorers, including strikers Nathan Burns and Roy Krishna who have combined for 22 goals this season. McGlinchey, who has played deeper behind those two as the season has progressed, has also scored five goals.
Tonight's game sets up as a contest where if the Phoenix were to get one goal, they could hammer home a few more as they've done frequently under Merrick.
"Football is a bit like that, the team that scores gets very confident and takes more chances going forward," Merrick said. "I know that we are capable of scoring more than one goal against any team in this competition."
The eighth-placed Mariners are still adjusting to life under new coach Tony Walmsley and Merrick said they would pose a strong challenge.
The Phoenix will be at full strength tonight with centre back Ben Sigmund back from injury. Goalkeeper Glen Moss (corked leg) and Vince Lia (hamstring) should be available for selection.