The incredible amount Celtic got for Tierney's sale

After trying to sign him for a long time, Arsenal managed to get Kieran Tierney from Celtic last summer. The young left back has played 11 times for Arsenal and he has not been able to nail down a place in the Gunners' starting XI because of the constant changing of manager. 

Injuries have not helped this promising footballer, who had four very solid seasons for the Bhoys before moving to the Premier League. 

With the new year, Celtic have made public their financial data for last term and in them, they have confirmed that Kieran Tierney's departure produced a profit of 27 million euros for the Glaswegian side. 

Tierney is 22, is a Scotland international and has played just 743 minutes so far this campaign after playing more than 3,000 in the last three.