Sanchez, 29, is in line to become the most expensive footballer in England with both United and Manchester City involved in a tug-of-war for the Arsenal player's services.
Sanchez is not certain to start against Bournemouth, as his relationship with Arsenal has deteriorated against the backdrop of his expected move to Manchester City or United.
Former Wales international Blake, who went on to have a successful career with eight different clubs, gave a harrowing account of the treatment he suffered as an apprentice at Stamford Bridge.
EXCLUSIVE: Saracens are lining up a move to bring exiled winger David Strettle back to England. Mark McCall is ready to offer the 34-year-old a deal at his former club when his Clermont contract expires.
ROB DRAPER AND NICK HARRIS EXCLUSIVE: And Russia planned to swap urine samples at the 2018 World Cup so that its footballers could take drugs with impunity this summer.