Since Wales' World Cup exit, Ramsey hasn't come back to Nice, according to the manager.
He said it was hard to digest that his country failed to reach the knockout stages.
Wales lost to England in their final group game on November 29th.
The 32-year-old, who has 78 caps for Wales, is taking his time to heal.
He was upset with the tournament.
Wales played in the World Cup finals for the first time in over 50 years.
After drawing the USA, they lost to Iran and England.
He has been a regular in the Nice side since joining the French club as a free agent in August, making 16 appearances in all competition and playing in 12 of their 15 league matches, including 90 minutes in their final match before the World Cup break.
Nice are going to play RC Lens on Thursday in the first game of the season.
Many World Cup players are back in France.
France's hero Kylian Mbappe was back training at Paris St-Germain three days after scoring a hat-trick in the World Cup final, while Argentina's World Cup winner Lionel Messi is expected to return on 2 or 3 January.