Barnes was forced to depart for Adam Idah early in the second half at Carrow Road on Wednesday night after he landed awkwardly making a near post run to attack a cross.
US international Josh Sargent is already ruled out until the new year, after damaging his ankle earlier this season in a 4-0 league win at Huddersfield.
“It looks like a knee ligament injury. How serious? He will have a scan tomorrow (Thursday) and we will know more then,” said Wagner. “It could be (a lay-off) but let’s wait until we know further. What the last games have shown is we have a certain depth in the squad.
“Our substitutes made an impact in this game. Przemyslaw (Placheta) was on it. Adam made an impact. Onel (Hernandez) did well and (Hwang) Ui-Jo had some good movements and one very good opportunity. We will use, and need, everyone.
“We said this before we started this intensive block of games leading up to the next international break. We have shown we can trust and believe in every single one of our players. Unfortunately injuries are part of the game. We hope it is not too bad.”
The Canaries pummelled the title favourites in the second half but Kasey McAteer pounced late on to inflict a first home defeat of the new season, after Kelechi Iheanacho’s penalty had put the Foxes in front before the break.
“We are obviously disappointed to lose, but the performance was top,” said Wagner. “I am absolutely fine with it. First half, Leicester were the better side. Second half, we were. We gave them too many dangerous spaces.
“You have to decide against a quality side which areas to give them. We gave them the wrong ones but re-adjusted it in the second half.
“The most annoying is the first goal we conceded. We had the ball twice in the build up and gave it sloppily away. We made three mistakes in 10 seconds and they punished us. Then we were not clinical enough, even though we created three or four very good opportunities.
“Gibbsy (Liam Gibbs) has to hit at least the ball. (Shane) Duffy can score with his header. Kenny (McLean) was unlucky and Ui-Jo on the near post was a good situation. You will not have 10 or 15 chances of that quality against Leicester. This is clear. But then you have to be clinical if you like to get something out of this.
“The players have done an unbelievable workload. They never gave up. The support was there from the stands. Everything was here to get the result. But we got beaten by a top side. Accept it, respect it. Now we move on.
“We had three points on the table and we were not able to grab it. Three more points are on the table this Saturday at Plymouth.”
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