Robertson last played in the Scottish Premier League on 3 October
Dundee United's Scott Robertson suffered a setback on his comeback from injury, picking up a groin strain in Tuesday's friendly with Dundee.
The midfielder, who had been out for more than a month, was taken off at half-time after straining an abductor.
Defender Garry Kenneth also damaged his groin during the 3-1 win and could now be missing for the rest of the year.
"It's not a major problem but for Scott it is frustrating," said United manager Craig Levein.
Goals from Andis Shala, Jon Daly and Danny Cadamarteri sealed victory for United in a game watched by 7,774 fans to mark the installation of United's new £270,000 floodlighting system.
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