Ronald Koeman has warned Victor Wanyama's admirers nobody will be leaving Southampton next month.
Tottenham failed to prise the midfielder out of St Mary's in the summer, and Arsenal boss Arsene Wenger was this month forced to deny he is planning a January move.
Southampton host the Gunners on Boxing Day, and ahead of that game Koeman has made it clear any bidders will be wasting their time.
"They can prepare whatever they like to prepare," he said. "Don't spend time trying to buy a player from Southampton because it's impossible.
"They talk about players from Southampton because we have some good players and there is always interest in players. And the ambition of players is about playing Champions League.
"We know what we like to do and how we like to do our business. That means in January nobody will leave Southampton."
Saints go into Christmas with just one point from their past five games, and Koeman admits his job could be under threat if that run continues despite the club's seventh-placed finish last season.
"Every manager is under pressure," he said. "If you sack Jose Mourinho, if you sack Garry Monk from Swansea - then we know.
"It's all about the philosophy of the club, the chairman, and the board. It's still quiet in Southampton but maybe in one month it can be different.
"We know if you are a long time in football what can happen and I'm not worried about that. If it happens, it happens. I do my job, I do my best for the club and do what I have to do, and nothing else."