Doak came through the academy before quitting for Anfield after a slight taste of first-team football at Parkhead. He managed to break into the top team down there too but has now moved for more regular game time.Read more:It was thought Celtic would not see a penny because the £600,000 fee was set by a tribunal when he headed for Liverpool.But the Scottish Sun is now reporting a sell-on clause was inserted and the percentage now due amounts to a seven-figure sum.The men from Glasgow's east end are in rude financial health and this will boost their coffers even further, the sell-on clause representing another smart piece of business.
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