Former England manager Sir Bobby Robson has died at the age of 76, following a long battle with cancer.
Robson will be best remembered on the international stage for leading England to the 1990 World Cup semi-final.
At club level, he cut his managerial teeth at Fulham before establishing his credentials at Ipswich where he won the FA Cup and Uefa Cup in a 13-year stay.
Spells at PSV Eindhoven, Sporting Lisbon, Porto and Barcelona followed before he managed Newcastle United.
Robson, who was born in County Durham and watched the Magpies from the terraces, returned to his native north-east in 1999 in what was to be his last major role in football.
After leaving Newcastle, he was a consultant for the Republic of Ireland side while he battled cancer, and later took on an ambassadorial role for the Football Association of Ireland.
Many floral tributes have already been laid at St James' Park and Newcastle have said the ground will also be open over the weekend.
United's players and staff held a minute's silence at the training ground on Friday morning.
Flags at the Football Association headquarters in London's Soho Square and at Wembley Stadium will fly at half mast.
Ipswich flags are also flying at half mast at Portman Road and there will be two minutes' silence before Friday evening's friendly against Real Valladolid which kicks off at 1930 BST.
Robson, who was first diagnosed with cancer 18 years ago in 1991, fought a brave battle against the disease. He beat bowel cancer in 1992, a malignant melanoma in 1995 and a tumour in his right lung and a brain tumour, both in 2006.
In 2007 he vowed to "battle as I've always done" following the start of chemotherapy treatment after being diagnosed with cancer for the fifth time.