Eisfeld posted the photo with the comment: 'True words #mourinho ;-)'
Harmless enough, right? Well praising the often antagonistic Chelsea boss didn't go down well with all Arsenal fans.
Several posted critical comments, or responses like 'Wenger has better quotes', which didn't go unnoticed by the young German himself.
Eisfeld re-tweeting the following message, and there were dozens of Arsenal fans who backed his right to speak his mind.
Stop giving hate to @eisfeld_thomas just because he posted a quote from Mourinho. It's a picture. Get over it.— Cassie. (AaronsArmy) (@RamboLover16) January 28, 2014
A mini-storm in a teacup. Let's hope Eisfeld gets his big Arsenal chance soon and gets his chance to prove himself on the pitch.
image: © Kieran Clarke