Hull defender Angus MacDonald has been diagnosed with the early stages of bowel cancer, the club has announced.
MacDonald, 26, had only recently returned to full training having been sidelined for almost a year due to deep vein thrombosis.
"Hull City are sad to announce that Angus MacDonald has been diagnosed with early stages of bowel cancer," the Tigers said in a statement.
Hull signed him from Barnsley for an undisclosed fee in January 2018, but he has made only 13 league appearances for the Sky Bet Championship club.
The Winchester-born centre-half progressed through Reading's academy and had loan spells at Salisbury, Basingstoke, Torquay (twice) and AFC Wimbledon.
MacDonald was released by Reading in 2013 and had permanent stints at Salisbury and Torquay before Barnsley signed him for an undisclosed fee in 2016.