"We consider that the management team at CelticFC are out of control and, in our view, this is evidenced by Mr Lennon's previous behaviour at Tannadice and at Tynecastle, for which he received a four-match ban, " said Smith's statement, referring to matches against Dundee United and Hearts.
His firm acted for Celtic last season in a Europa League row involving FC Sion, which eventually saw the Scottish club replace the Swiss one in the competition's group phase.