San Antonio Spurs fans are yet to see superstar Kawhi Leonard take to the floor since his season was cruelly ended in the playoffs last year following an ankle injury.After recovering from that setback, the small forward was ruled out of the team's entire pre-season schedule with a quad injury and missed their season opener against the Minnesota Timberwolves.The two-time All-Star will also sit out the Spurs' clash with the Chicago Bulls tonight and judging by some interesting footage of the star, he may not be returning to the court anytime soon.KSAT 12 sports reporter Larry Ramirez posted a video on Twitter which caught Leonard struggling to get up the staircase to board San Antonio's flight to Chicago.

The two-time Defensive Player of the Year was moving very gingerly and was either being very careful or was in real discomfort.

But either way, this is not what the team would like to see from a player who their whole season revolves around on both ends of the floor.

This will come as a huge worry for Spurs fans, especially since the team is being very discreet on his status and when he's likely to return.

At the beginning of training camp, the franchise said Kawhi “continues a rehabilitation programme for right quadriceps tendinopathy” and that a “timetable for his return to the court will be determined at a later date.”

Nothing has been determined yet and this footage could possibly be an indication that they're either unsure of his return or looking for a right time to confirm that it'll be a long-term issue.

The 26-year-old is one of the candidates to win MVP this season and a significant period on the sidelines could hurt his chances.

'The Klaw' enjoyed a career year that saw him earn All-NBA First Team honours and a third-place finish in MVP voting and was surely expecting to take his game to another level this campaign.

But without the former Finals MVP in the lineup, the Spurs were still able to defeat the Timberwolves 107-99 in the home opener on Wednesday night.

LaMarcus Aldridge - who recently signed a three-year, $72.3 million extension - stepped up and posted 25 points, 10 rebounds, four assists, two blocks in the win to fill the void left by Leonard.

The Texas-based outfit also added Rudy Gay over the summer and he can help to carry the load.

With Gregg Popovich at the helm, San Antonio will always be competitive but the health of their star player will become a huge concern the longer he stays out.