Alejandro Garnacho starred for Manchester United on Tuesday night in the Carabao Cup third-round win. Under the lights at Old Trafford on Tuesday night, we witnessed a seven-goal thrashing by Manchester United, with League One Barnsley unable to cope with the rampant Red Devils. Erik ten Hag watched his team put seven past the opposition, the highest goal tally he has achieved as the United manager – although less than the 13-0 Ten Hag achieved at Ajax. Alejandro Garnacho scored twice and assisted twice in the game, once again being among the best players on the pitch and United’s most impactf…