The French goalkeeper has been a revelation in recent matches after replacing David Cornell between the sticks and has been instrumental in the club's three-game unbeaten run. Dilo, however, injured his knee in an accidental collision with team-mate Darren McGregor during Saturday's 4-3 win over St Johnstone and will discover the extent of the damage later today.
"Chris is going to be doubtful for us and that's a bit of a blow," said Danny Lennon, the St Mirren manager. "I think it was Darren who clattered him and he has done some damage to the outside of his knee. Chris has come in and grasped his opportunity well. He looks to be maturing and benefiting from the experience gained from playing every week.
"It's early days and we'll monitor the situation. But he's certainly looking doubtful for this week. It was an innocuous way the injury came about but when something like this happens it's always an opportunity for someone else. You move on and deal with the tools you have available."
Dilo's loss would seem to be Cornell's gain, with the Welshman set to come off the bench to regain his place in the team. Lennon hopes the goalkeeper will make the most of the opportunity. "David has already had invaluable experience of going in there and he's got to use it and cash in on it . . . if he's given the starting position on Saturday," added Lennon. "Goalkeeper is a specialised area and I don't profess to have a great deal of knowledge about it, but we have two keepers who are very comfortable with the ball at their feet and who are capable of producing saves. The biggest test for them at this moment in time, though, is their temperament."
Lennon was delighted to see his team continue their good form by beating St Johnstone but admitted the loss of three sloppy goals was still a concern. He added: "You take the positives. And those are three very valuable points, a very spirited performance, and back to back wins, which is something we've not done in a long time. But in terms of the previous two games and the way we defended resiliently, I was disappointed with the goals we conceded."
St Mirren's resurgence, along with Kilmarnock's win over Ross County, meanwhile, compounded a miserable weekend for Hearts manager Gary Locke. The administration-hit club fell 13 points adrift at the foot of the SPFL Premiership following defeat by Motherwell and victories for his fellow strugglers.
Defeat this Saturday at Rugby Park is not an option insists Locke, who admits his young team will face an uphill battle to preserve their topflight status if they lose further ground at the bottom.
He said: "We can't afford to let the gap get any bigger. We knew it was going to be a difficult season, but we've got to keep these teams within touching distance. The players again gave everything for the cause, we just don't seem to be getting the breaks but hopefully that will turn."