Dion Charles is set to be out of action for two to three weeks after he was forced off against Wycombe in midweek.
The Northern Irish international picked up a knee injury against the Chairboys, although it is not thought to be anything serious.
“He has a slight MCL injury,” said Ian Evatt. “It is not serious, that is the most important thing, but it is enough to miss two or three weeks, I would think.
“He obviously stretched and it was a block tackle. That is how those types of injuries happen.
“We are fortunate enough in a way that it is not serious, but it is significant enough for him to miss two or three weeks.”
Aaron Collins played alongside Charles on Tuesday night – the forward’s first start for the Whites since his move from Bristol Rovers.
Jon Dadi Bodvarsson scored after coming off the bench, while Victor Adeboyejo also made a positive impact in the final third.
Collins’ arrival in January bolstered Evatt’s strike department after Dan Nlundulu suffered a torn hamstring.
“That was partly the reason we did what we did,” the manager continued. “It has been rough again, it is never easy. We have now lost keeper, captain and leading scorer.
“We are being challenged and tested but, as always, we will keep grinding on, keep our heads down and keep trying to get results.
He added: “With adversity comes opportunity, we have said that a lot, and it is down to someone to step into Dion’s shoes.
“They are big shoes to fill, he has scored a lot of goals for us. We believe in all our strikers and it is down to one of them now to grasp the mantle and take it forward.”
The Whites had to dig in to secure all three points against Wycombe and Evatt was encouraged by their resilience.
“We have had a conversation this morning with the players,” he said. “Winning is all important, of course. Especially at this stage of the season, winning is vital.
“However, you give yourself a much better chance of winning if we stick to the process and our performance levels are high.
“We are process-driven, I am a process-driven coach. It is not rocket science that the better you play, the more likely it is you will get a result. You want to play as well as you can, first and foremost.
“But on the flipside of that, this team has developed a nice habit of finding different ways to get results and win games. Good teams normally do that, so that pleased me.”
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