“Andy is going to have to get a scan but it is looking like we might lose him for the season,” said Stewart following Saturday’s 1-0 derby defeat at Keith.
With Greig Sim away with his work, Buckie drafted in Aaron Sherman from junior neighbours Buckie Rovers at Keith.
He was arguably their best player as they lost 1-0, to start the season with three straight defeats.
After the opening 5-2 defeat to Cove Rangers, followed by the midweek 4-1 extra-time loss to Locos in the Aberdeenshire Cup, Buckie had been looking to get their season kick started with a good result at Kynoch Park.
However, it was a disappointing afternoon which ended in two red cards for the visitors, with Iain MacRae and Lewis Mackinnon being sent off in the space of 30 seconds near the end.
Despite the difficult start to the campaign, Stewart said: “I believe in them and I think we will achieve good things.
“We did look leggy from Wednesday but I wanted to keep the majority of boys who did well on Wednesday.
“It has been the story of our season so far. We had chances against Cove, against Locos we had chances. We are not taking them and have to work on our finishing.”
Stewart believes the second yellow card shown to MacRae was harsh, while he admitted that his player-assistant Lewis Mackinnon should have known better than to say something to the referee about the decision, which also saw him red carded.
“Lewis probably shouldn’t have got involved. He said ‘that was a disgrace’. He told me he never swore.
“It makes it look like we lost our discipline and we’ll just have to take that on the chin. We have to stick together. We are all down just now.
“Our fitness is not quite there because we have had three or four boys just back from holidays. I am not going to make excuses because we were still good enough to win that game today.
“I still have faith in the guys and they are really good players.”
With Andy Low and Dennis Wyness both out injured on Saturday, Lewis Mackinnon was played up front.
It does not get any easier for the Jags this weekend who welcome champions Brora Rangers to Victoria Park, fresh from their 11-0 mauling of Rothes last weekend.