According to the Daily Record...
"The Tayside club supposedly approached the Premiership champions about taking the 25-year-old back to Tannadice until January, according to reports in the Dundee Courier .
Mackay-Steven, who left the Tangerines to join the Hoops in a double deal along with Stuart Armstrong back in January 2015, is reported to have rejected the move as he looks to force his way into Brendan Rodger's side."