Lees has missed Sheffield Wednesday's last three games through injury and is at risk of sitting out next week's trip to Elland Road.
If Vincent Sasso starts for Sheffield Wednesday against Nottingham Forest on Saturday, he will equal his longest run of league games (four) in Carlos Carvalhal's side - a statistic which has caused this writer re-think his previous criticism of the Frenchman.
Spells such as the one Sasso is currently enjoying - granted, against a trio of teams from the Championship's bottom half - are the first ingredient any player needs for success, after, of course, initial opportunity, which was presented by an injury to Tom Lees.
Lees, who, according to Owls head coach Carvalhal, is closing in on return to contention, will perhaps wonder if he's sat out one game too many. Had Tuesday's win over Blackburn Rovers been scheduled for this coming Saturday, it is likely the former Leeds United defender would have reclaimed his shirt from Sasso.
Sheffield Wednesday's Tom Lees (right)
Instead, Wednesday's number 39 scored both of his side's goals against Rovers - in some style, too - and arguably gave his best defensive display since arriving at Hillsborough in 2015, initially on loan.
It was certainly his most confident - as evidenced by the way he attacked the ball for both of his goals and remained calm in possession until a space to pass presented itself. There was little sign of panic, either, as Sasso made any of his 12 clearances - more than any other Wednesday player, in fact - while his willingness to battle and battle well belied his devilish good looks.
Sheffield Wednesday's Vincent Sasso (right)
As good as Lees has been since a Leeds oversight saw him fall into Wednesday's lap for next-to-nothing the previous summer, his shirt is now almost certainly in the hands of his 25-year-old teammate - who has kept two clean sheets in Lees' absence, conceding only to his own player, and could deny him an outing at Elland Road in 10 days' time.
Whether or not Sasso, whose contract expires in less than four months, can hang onto it long-term remains to be seen - although you'd bet good money on him still being around to challenge next term.
Should Lees come back in against Forest?