Martin joined his brother this week in Dunedin and coach Terry Phelan sees them as more-than-useful additions to his training group.
"They add to the experience we need, and will increase competition for places in this weekend's travelling squad," he said.
The appearance of the Genschur brothers was almost a mystery to club officials.
Eckhart Marhten, an Otago football fan, took the initiative to enlist them through his business, which recruits German youngsters to study in New Zealand.
"I just thought I would widen the search to include footballers, and although both Martin and Robert have finished their studies, they are having a gap year, and I am sure they will enjoy their time in Dunedin," Marhten said.
Coming from the small town of Riesa, the brothers studied at nearby Leipzig and were encouraged by their parents to work hard at sport.
For Martin (25), it paid off early when he was selected as a youth to play for Munich club 1860's reserve side.
He then moved to FV Dresden for a couple of years before teaming up again with brother Robert in signing for SSV Markranstaedt in the Nord Oberliga, where they played together in midfield.
Both players have sound technique, a good first touch and enough pace to interest the Otago coaching staff.
Martin is a midfielder and Robert also has experience as a striker.
This should appeal to United, which has always struggled to score goals in the NZFC.
The brothers know little of New Zealand football, other than Wynton Rufer, whose career with Werder Bremen made him as much of a household name in Germany as in this country.
However, the Genschurs rate New Zealand football as being very fast.
Whether their more methodical style will fit in, only time, and coach Phelan, will tell.
