 Complete the following phrase:  Robertson began his senior career with Queens Park in 2012 before joining Dundee United a year later. His performance during his first season as a professional led to him being named PFA Scotland Young Player of the Year and also making his international debut. He joined Hull City in July 2014 for a fee of 2.85 million, before joining Liverpool in July 2017 for an undisclosed fee, believed to be an initial 8 million. He appeared in successive UEFA Champions League finals in his first two seasons, losing the first in 