"We'll have a look at it on the video and if it's a case where we can appeal it, we will because I think he was harshly treated," said Jefferies.
"My first thought was that he was hard done to. At worst it was a foul."
The midfielder had not long been on the field before his 52nd-minute ordering off, having come on as a substitute just before the interval.
"It looked to me as if he was just stretching for the ball and he caught the boy accidentally. He didn't do it with any malice or intention
"If the referee had given a yellow card it would've been maybe even a bit harsh, but to give that was a bit ridiculous."
Hearts rallied after losing a man and also had to contend with several injury problems as they battled to victory.
Dawid Kucharski was withdrawn for Kingston, Marius Zaliukas also limped off and Lee Wallace required bandaging on a head wound near the end.
"I don't know how many changes I had to make in that team today," added Jefferies.
Overall, we deserve the win just for our battling qualities and considering what we had to put up with
"I lost the two centre-halves, we've had a man sent off, we went down to nine men with Lee Wallace then showing great spirit not to go in and get stitches, just to put a patch on it.
"It was a battle today and it was just about who got the goal and who didn't."
It was Eggert Jonsson who got that solitary strike, the versatile player beating goalkeeper Jamie Langfield with an overhead kick.
"We came up with a great goal and that's what settled the game," added Jefferies.
"Overall, we deserve it just for our battling qualities alone and, considering what we had to put up with, we came through it great.
"Eggert gave me a problem because when he plays in midfield, he's got a fantastic appetite to go and get involved and work hard for the team.
"Sometimes you want him to just sit and let others go forward.
"With him in there he just seems to want to do everybody's work but then I had him at centre-half and suddenly I find him in the box scoring with a wonderful finish.
"He's capable of doing that. It was great that he came up with a goal today and I think once you get that goal, it really lifts the team for them to hold on to something."
Source: BBC Sport