On the other hand, the away side make the trip to Santa Fe aiming to record consecutive victories having returned to winning ways last time out.
Match preview
Union had to make do with a point for the second game running following a goalless draw against Talleres Cordoba in Tuesday's clash at Estadio Mario Alberto Kempes.
Despite being on the back foot for large spells of the contest, Gustavo Munua's men held firm to come away with a hard-fought share of the spoils.
As a result, El Tate remain 25th in the Argentine Primera Division table but still hold a seven-point buffer on teams in the relegation zone approaching the midway point of the season.
Next up is the challenge of an opposing outfit who have come out on top in three of the last four editions of this fixture dating back to 2010.
Having kept clean sheets in three of their most recent four matches, Saturday's hosts will be confident of putting another solid defensive display in front of their fans.
Platense snapped a two-game losing streak courtesy of a 1-0 victory over Sarmiento Junin at Estadio Ciudad de Vicente Lopez on Sunday evening.
Carlos Martinez's men opened the scoring five minutes into the second half through Franco Diaz and that turned out to be the all-important moment in a contest where clear-cut chances were few and far between.
With 32 points from 24 league matches so far, Tinta de calamar sit 14th in the standings, three points adrift of the last continental spot.
Currently on a tough run of results on the road where they have lost six of their last seven outings, Saturday's visitors could certainly do with an upturn in form away from home.
Union Argentine Primera Division form:
D
D
W
L
D
D
Platense Argentine Primera Division form:
L
W
W
L
L
W
Team News
Platense's Gonzalo Valdivia has not featured since the final week of May due to knee injury and the defender remains unavailable for selection.
Currently on a six-game goal drought, Nicolas Servetto has lost his place in the visitors' starting XI but could be recalled for this one.
Having watched his team failed to score in three straight matches, Gustavo Munua could be contemplating making some changes to his attacking unit here.
Junior Marabel is one of those who will be pushing for a starting spot after the 25-year-old recently made his return to action from an injury layoff.
Union possible starting lineup:
Moyano; Paz, Calderon, Corvalan; Vera, Roldan, Gordillo, Luna, Del Blanco; Domina, Machuca
Platense possible starting lineup:
Macagno; Lozano, Vazquez, Pellegrino, Infante; Diaz, Rossi; Martinez, Castro, Marcich; Quiroga