While he was eventually able to make his way from the pitch with assistance, it’s understood the injury will result in a two-week lay-off at the very least, leaving him facing a race against time to be fit for United’s season-opener against St Mirren on August 14.

Boss Peter Houston said the player was “absolutely devastated” by his latest injury blow and had been raring to get his Tannadice career on track after barely kicking a ball last season.

“The boy was in tears when he went down, so he obviously knew he’d hurt himself,” said Houstie.

“It’s a blow for him because he’d been working so hard to be involved this season.

“He’s had a terrible time with injuries, so to pick this one up now is unfortunate.

“You never know with hamstring injuries what the lay-off’s going to be so we’ll keep an eye on him, but it’s at least two weeks. He’s absolutely devastated.”

For United fans, too, Sandaza’s latest injury will be a bitter disappointment. Opportunities to see the 25-year-old striker in action have been limited since his arrival from Valencia in 2008.

A promising first season at Tannadice in which he netted 10 goals, despite a festive-period injury, whetted their appetites, but a groin problem picked up the following pre-season meant he made only a handful of appearances towards the end of last term.

Houstie described the 2-2 draw with Livingston as a “great workout”. A mix of youth and first-team players were tested by the Second Division side.

“The result wasn’t important,” said Houstie. “It was more important to get a few of the boys 90 minutes, and I’m delighted with the way Darren Dods, Damian Casalinuovo and Jeno Myrie-Williams came through, in particular.

“It was a great workout. I was delighted with our application and effort.”