Republic of Ireland boss Giovanni Trapattoni has admitted a move to Everton could provide a major boost to James McCarthy's international career.
The 22-year-old midfielder has been given permission to delay joining up with the Republic ahead of their World Cup qualifiers against Sweden and Austria with the Toffees understood to be stepping up their interest in him ahead of Monday night's transfer deadline.
McCarthy, who has 16 senior caps to his name, has become a key member of Trapattoni's team in recent months.
However, the Italian, who has at times described the Wigan man as "shy" on the pitch, believes exposure at a higher profile club would help to develop him further as a player.
He said: "Obviously, the more important games he plays, the more his personality will increase.
"I said last month I was happy because I have seen James McCarthy play with good personality on the pitch. Against Germany, against Georgia, he did very well and he has increased.
"He is at Wigan now, but if he changes, I am sure it will be good for him to go to a more important team. With that, he can think, 'I am an important player' - that is important."
Trapattoni confirmed that McCarthy had been given leave to complete a potential transfer and he is hoping to see a happy man when he does eventual report to Ireland's Portmarnock base.
He said: "I spoke yesterday with James because at this moment, he has the opportunity to change teams. I said, 'Okay, you stay with your club now and decide your position' because he could be happy.
"A new possibility will be for him very, very important. One day more for this decision is important for him and also for us because he will come back happy after this situation."
However, McCarthy's chances of sealing a switch to Goodison Park could depend on whether or not the Toffees sell Marouane Fellaini to Manchester United, a move which has been the subject of speculation for much of the summer.
Wigan chairman Dave Whelan confirmed Everton's interest in McCarthy - he also revealed that Newcastle had been in touch, but were nowhere near his asking price of at least £14million - after taking a call from Roberto Martinez while speaking to journalists in Ireland.
He told the Irish Independent: "Roberto is chasing James. If Everton sell Fellaini, they are going to come in again for our boy.
"It depends whether Fellaini goes today. I have heard that he's definitely going.
"If Fellaini goes, Everton are going to get their £30million or whatever. Roberto knows what James is valued at, so they've got to come back in with the right amount. You've got to be talking £14million or maybe a little more.
"I would never stop a footballer going up to a bigger club or to the Premier League. I know what it's like if you stop a footballer going to the club he wants to go to; you never get the same response or loyalty out of him ever again if you stand in his way."