The German believes the tail-end of the season is when the Brazilian's exit will be most keenly felt.
The Frenchman joined Tottenham Hotspur late in the window.
He joined Arsenal for over £30 million this past summer.
Tottenham Hotspur visit North London rivals Arsenal on Sunday.
Liverpool are currently joint-top of the Premier League table.
The Reds are some people's dark horses for the title this year.
The ex-Liverpool midfielder feels that Georginio Wijnaldum is an excellent arrival.
The Liverpool midfielder is part of Germany's squad at Euro 2016.
The Southampton manager is reportedly close to taking over at Everton.
The Arsenal star is set to star for Germany in France this summer.