Manchester United manager Alex Ferguson has snubbed the chance to give his backing to any aspirations Roy Keane may have to be a future manager of the Red Devils.
He had previously backed him but was angered by Keane's comments about his team-mates' display at Middlesbrough.
"Young managers come along and people say this one will be England manager or boss of this club, but two years later they're not there," said Ferguson.
"It's not an easy environment to come into, I wouldn't forecast anything."
Keane, 34, is out of contract in the summer and his future at the club is unclear, but his comments to club television channel MUTV after the game caused a storm at Old Trafford.
Ferguson has never been one to criticize his players in public, and he is thought to have been particularly upset by Keane's comments, which were never broadcast but leaked.
He insists he will have no say in who follows him as Old Trafford boss.
"When I go it won't be my decision who replaces me, it doesn't matter who says this or who says that," said Ferguson.