Benjamin Nygren was quickly back on the goal trail as Celtic began the defence of their Premiership title with a 1-0 home win over Dundee. Before the game, Celtic fans cheered as the captain, Callum McGregor, unfurled the flag which confirmed again a 14th title win in 15 seasons. It was all a bit flat in a first half with Martin O’Neill’s side struggling to get into their stride as the visitors posed problems. However, the Sweden midfielder Nygren, so prolific last season with 21 goals, struck…