The Paisley side will hope to bounce back from successive Scottish Premiership defeats to Motherwell and Aberdeen as they face on the in-form Terrors.
The only casualties Lennon will not be able to count on are winger Gary Teale (hernia) and defender David Barron (ankle) who are still unavailable as they continue to battle back from injury.
Dundee United manager Jackie McNamara hopes to have a full squad for Thursday's showdown.
Winger Gary Mackay-Steven has a knock but is hoping to be available.
Full-back Keith Watson could also return after not being risked for the weekend win over Ross County following a knock.
McNamara said: "We will have every respect for St Mirren. They like to get the ball down and play like ourselves so it should be open in that respect.
"We're on a good run of form right now but we know what St Mirren are capable of on their day.
"We'll need to be wary of them and we will be because our aim is to keep this run going. There are no easy games in this division and that will definitely be the case when we go through there."