Liverpool hero Dean Saunders has questioned Chelsea's move for Real Madrid striker Alvaro Morata.
The Blues have agreed a deal to sign Morata from Real Madrid in a deal which could reach £75m.
The 24-year-old is now set have a medical before putting pen to paper on a five-year deal worth around £150,000-a-week.
But Saunders, formerly of Liverpool and Aston Villa, says there can be no guarantee he will be a success in England, pointing to Andrey Shevchenko's struggles for the Blues.
"Turn the clock back a while, Shevchenko signs for Chelsea," Saunders told talkSPORT.
"Everybody in the world would have signed him and it didn't happen for him.
"Whether it was the different country, didn't settle in, played with a different partner than he used to play with.
"It's always a gamble. I think the only safe bets you've got are people like [Alan] Shearer and Michael Owen, people who have been brought up in this country and done it for 10 years on the bounce.
"[Jermain] Defoe, I keep going on about him, he's the nearest thing to a safe bet.
"If Defoe played for any of the top six next year and played every week, he'd get 15-20 goals. What's that worth? Free transfer he was."