You should have kept him mate! Trading Modric for Kaka does not compute lol

You'll be able to buy a good, younger replacement though if you look around.
Personally, I'm using Modric at right midfielder because Huddlestone demanded selection and has been close to my best player, so his effectiveness is limited; I'm keeping him for when Parker retires though. I could easily sell him and buy someone that is much better in that role though.
Though their overalls aren't that high, Parker and Adebayor are absolute beasts. Parker doesn't stop working and strangely he has scored 7 goals in the league. Adebayor simply won't stop scoring, he scores in clumps generally.
My current Spurs outfit is (at full strength);
Neuer
Walker Chiellini Dawson Marcelo
Modric Parker Huddlestone Bale
VDV
Adebayor
However, Chiellini only played four games (I signed him on deadline day in the first window) and has missed the rest of the season through injury, Marcelo has been.....divisive and Neuer hasn't kicked on very well.
What's your line-up at the moment?
My next purchase will be a striker (depending on how much money I have) and then a focus on depth.