Manchester United is monitoring Jackson now. His future is becoming uncertain with the came of Delap and Pedro to the Chelsea's squad.  It means a competition to be the number one in the striker position is just getting even harder. It makes sense if United is looking for PL proven striker instead of repeat the same mistakes they did last seasons.
The only problem is Chelsea wanted 100m for him, which is a very hard to be fulfilled by MU. It will be so good to see him goes to the MU. 

I hope MU can offload their current strikers, then buy Jackson out from Chelsea.