The Denmark international has been in superb form for Tottenham this season and the Spurs manager is anticipating interest in the playmaker when the transfer window opens
The Denmark international, who joined the club in an £11 million deal from Ajax in August 2013, has been in superb form for Spurs this season – scoring seven Premier League goals and providing nine assists.
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"You are always fearful that someone might come and take one of your best players and Christian is certainly one," he told reporters.
Sherwood claims he first spotted the playmaker's talent when he was 18 and playing for his country against England.
He added: "I watched him for Denmark in 2011 and I rang Daniel Levy the day after and said that he needed to sign this boy.
"I don’t think he was available [at the time]. I think he wanted to continue his education at Ajax and that is what happened.
"And perhaps Daniel didn’t follow up on it as he does not follow up on every player I tell him, as there are probably too many.
"He had a year left at Ajax. He has been great acquisition for the club and they have done well to bring him in."
Sherwood also hailed Eriksen's desire to improve, claiming he is “out there every single day” honing his skills.
"He is out there every single day," he said. "I always say to the guys, 'Andy Murray doesn’t just go out there and hit cross-court winners when game day comes'.
"You need to practice it as if you don’t practice it why do you expect to do it on the big stage when the pressure is on.
"Christian doesn’t see the pressure, doesn’t feel the pressure, as it is embedded in him as he works so hard on it every day.
"He has just turned 22 but has the head of a 35-year-old. He knows when to speed it up and slow it down."