The Sky Blues' Under-21s suffered defeat as George Maris' second-half strike sealed the three points for the away side...
Coventry City defender Jordan Willis completed 28 minutes before being taken off as a precaution as the Under-21s suffer defeat.
The 21-year old Academy graduate was making a comeback from a previous knee injury but was taken off as a precaution during the first-half and will be monitored by the club's physio department over the coming days.
Barnsley controlled most of the game and had the first chance when James Bree's low effort was deflected narrowly wide in the 6th minute.
City struggled to create any chances in the first-half as Bassala Sambou headed over tamely from a Ben Stevenson free-kick with 34 minutes gone.
The Tykes took the lead in the second-half when City lost the ball in midfield and George Maris broke to slot home from a tight angle seven minutes after the break.
Despite the lack of chances for the home side, City should have equalised when Sambou crossed for Lateef Elford-Alliyu who fired wide from close range.
The Sky Blues' best chance of the game came in the final seconds as Dion Kelly-Evans' header was blocked on the line from Ben Stevenson's corner as City suffer defeat.
City's Under-21s coach Lee Glover said: "It was extremely disappointing and there weren't many positives to take from the game.
"The players need to work harder if they're going to step up a level. We were young but that's no excuse as so were Barnsley.
"We need to look back on the game and really improve on the performance today. They've got to put it right and we need to see improvements."
Coventry City U21s: Addai (GK), Di. Kelly-Evans, Willis (Ford 28), Harries, Haynes (Leahy 46), Bayliss, Stevenson, Shipley, Elford-Alliyu (Smith 77), Albini, Sambou.
Barnsley U21s: Walton (GK), Bree, Dawson, Drennan, Scott, Gooda, Chippendale (Templeton 70), Abbott (C), White, Jacobs, Maris.
Subs: Jeffs, Wardle, Smith, Murphy