St Mirren fans have taken to social media to vent their fury after a Celtic sign was placed above their club shop.

Celtic will play three friendlies in Paisley while maintenance is carried out to Parkhead before the start of the 2015/16 season.

In a bid to cash in, Celtic appear to be using the St Mirren club shop to sell official Hoops merchandise before the games.

However, Buddies have not taken kindly to this and hit out on Twitter.

One fan tweeted at the club and chairman:

.@saintmirrenfc @StewartGilmour1 As a St Mirren season ticket holder I insist the Celtic signage is removed from the stadium. Unacceptable. — Soctty123 (@Soctty123) July 1, 2015

Another added:

@bawarmy can't buy a saints kit at St Mirren Park but can buy the Celtic kit. What a disgraceful situation — Mark L (@MarkMirren) July 1, 2015

While one found reason in the sign posting:

@davieb82 well obviously they've struck a deal to temporarily sell Celtic stuff. St Mirren will get a fee. Celtic make a profit. Win Win. — Dean Craig (@Dheano) July 1, 2015

The Bhoys take on Dutch side Den Bosch tonight, Dukla Prague on Saturday and will play David Moyes’ Real Sociedad on Friday July 10.