Aberdeen have to pile the pressure on Celtic by aiming for second spot in the Premiership.The winger knows his former club has had an indifferent campaign compared to their stellar standards over the past nine seasons.The situation has been compounded with Rangers racing clear at the top while Celtic came back from their controversial Dubai break and straight into a Covid-19 storm.The Dons are five points behind the Hoops, who also have a game in hand, but Hayes is adamant his team need to look