Newcastle United legend Alan Shearer has questioned Manchester City's big-spending plans.

"My worry is in three, four or five years time if these people get bored with the club, what does it do to Man City?" Shearer told BBC Sport.

"We're talking about a special player, probably the best in the world, but you can't tell me anyone is worth that."

In 1996 Shearer became the world's most expensive player when he moved from Blackburn to Newcastle, with the current transfer record held by France's Zinedine Zidane, who moved from Juventus to Real Madrid in 2001 for £47m.

"I found it an honour and I relished the pressure that went with it," said Shearer.

"But this money is in another league from anything we have ever seen before - it's an incredible amount.

"I certainly wasn't worth £15m in '96 and he's not worth that amount of money now and I'm sure he will be the first to come out and say that."