Smullen’s biggest career win came on Harzand at Epsom

Nine-time Irish champion jockey Pat Smullen is being treated for a tumour and faces a lengthy spell out of racing.

Smullen, who won the 2016 Epsom Derby on Harzand, missed the start of the Flat turf season at the weekend.

Medical tests have shown that his illness is more serious than first thought.

“A tumour was discovered and I won’t be riding for the foreseeable future,” said the 40-year-old.

Smullen, stable jockey for trainer Dermot Weld, has recorded a string of big victories during his career including the 2000 Guineas with Refuse To Bend in 2003 and the Gold Cup at Ascot on Rite Of Passage seven years later.

In a statement to the Racing Post,