The Toffees boss has warned the deal is not done for the Besiktas striker as the Blues prepare to splash out £25m on the Turkey global.
The Turkey global has scored 14 goals in 24 appearances in all competitions for Besiktas this season.
"I need more goals in the side than what we have at the moment if we are to just maintain our position, because we have started to struggle to create chances and score goals in recent matches".
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Crystal Palace saw a bid for Tosun rejected by Besiktas on transfer deadline day in August, while Tottenham and Newcastle have also been credited with an interest in the 26-year-old. We can't cloud the fact that we've won more penalties than anyone else in the Premier League, that won't always happen.
"The players that are already here, like Sandro, haven't picked up the pace of the Premier League and been able to show what they showed in Spain".
Sam Allardyce has been keen to add more goals to his squad since he took charge of the club at the end of November and Tosun has emerged as the Everton boss' top target.
"I think he's got a bright future, but I don't think we can rely on him week in and week out at the moment".