View: Celtic must rival Everton to sign 50-time international reportedly valued at £8m
Roberts replacement
Roberts was immaculate for the Bhoys last season, as his rapidly increasing talent was highlighted in his stats.
Scoring 11 goals, the 20-year-old also added 19 assists during the 2016-17 campaign and that must be replaced ahead of the new campaign if Celtic are to remain at the top.
His creativity is in desperate need of being replaced, and Grosicki could be the man to do just that after supplying five goals in 15 Hull appearances in a side that struggled in the final third.