They both arrived at different ends of the Celtic spectrum. Arne Engels was a record signing for the club as they splashed out £11million to land the Belgian from FC Augsburg. He was the marquee signing for Brendan Rodgers and his scouting team to hang their hats on after Matt O’Riley switched to Brighton for £30m. Former Dundee captain – and diehard Hoops fan – Luke McCowan was a much more humble acquisition for closer to the £1m mark – a fee the club have been used to spending in recent times. READ MORE: Alex Valle shares class Instagram message after ‘dream come true’ Celtic scenario in Ata…