Reports says Latics chairman Dave Whelan has agreed on a £14million deal for the Honduras international.
Wigan boss Steve Bruce said: “The two clubs have virtually agreed a fee. It is how that fee should be paid.
“It is up to us as a selling club to demand what we want in terms of how we should be paid and how we should be structured. We will see what happens.
“Wilson is still with us and I’m preparing him to play against Manchester City tomorrow.
“That’s the situation at the moment, but we will see what happens in the next few hours.”
He added: “You look at what we bought him for and what we might sell him for and it is quite remarkable.
“But as a manager you don’t want to lose one of your best players.
“Of course we have to be realistic, which I am.
“We are Wigan Athletic and if it is the wish of the player (to leave) all these things have to be taken into consideration.
“Spurs can offer bigger contracts than us. They can blow us out of the water, but it would be like losing my right arm.
“The last thing I want to do is dismantle my team. Wilson has come from nowhere to being one of the best midfield players in the country.
“When we played Manchester United in midweek at Old Trafford, it didn’t phase him at all and at his age he can only get better.”