Wigan have signed Chelsea and England Under-21 midfielder Josh McEachran on loan until the end of the season.
"This is a big scoop for us. There's no doubt Josh is a huge young talent," Rosler told the club website.
"We have worked really hard to convince him and Chelsea this is the right place for him to be."
McEachran is eligible to play in this weekend's FA Cup fourth-round tie against Crystal Palace.
He was at Swansea during the 2011-12 season, and has made 11 league appearances for the Blues since his debut in 2010, as well as playing 13 times for England's Under-21s.