"Mentally to be travelling away for six hours on a bus to Lower Hutt knowing, realistically, we're focusing mainly on the Chatham Cup [isn't easy] but, to be honest, the boys were pretty professional with a good performance for the most part," he said.
However, the second-placed Rovers, on 34 points, host third-placed Wellington Olympic, a point behind, in a 2pm kick off this Saturday in what should be a humdinger and an ideal preparation for the Blues before Onehunga.
"There'll be competition for places, in terms of the starting line up for the Chatham Cup, because everyone wants to play so these games are important on our decisions on who starts."
Robertson said driving rain punctuated yesterday's game but it didn't have much of an impact on a slick artificial pitch.
Significantly Gavin Hoy, Jonny McNamara and Martin Bueno were all serving suspensions and goalkeeper Joshua Hill was out with a shoulder injury.
Liam Schofield and captain Fergus Neil also are out against the Greeks in the next round due to accumulated yellow-card suspensions.