Both players are very good players, they were necessary transfers for Galatasaray.
I hope they will adapt to the team as soon as possible.
Actually the situation isn't very bad now. It is the truth that none of these players has been the first choices for Tottenham in the recent times. However Sanchez played in the half of the matches in the Premier League last season. When it comes to Ndombele he was loaned to Napoli the last time and he was a part of 40 matches last season.
If they work hard in training it might not take them a long time to get ready for the season. Galatasaray will hope these players to have match fitness before the Champions League group matches start.
If Sanchez and Ndombele both show impressive performances the defense line of the team can be more credible in the group matches.
I think these guys will be successful, they are really quality players and they will contribute a lot to Galatasaray.
If they had played so well, Spurs wouldn't have sold them anyway.
Anyway, we will watch and see them all soon.