Quetta Gladiators and Islamabad United to face-off in the season opener.
Neesham is also very popular amid cricket fans especially because of his exploits in social media.
Pakistan's current T20I captain Babar Azam will play for Karachi Kings.
Watson has been a regular in all the PSL seasons in the past.
In recent times, a lot of overseas players refused to tour Pakistan but changed their minds after being offered more money.
The PSL saw many stellar performances, paving the way for international recognition for many overseas players.
The PSL player’s draft 2019 will take place in the first week of early next month, although the details were yet to be confirmed.
Of the 28 cricketers in the list coming from eight nations, seven are from England, six from South Africa, five from the West Indies, three each from Afghanistan and Australia, two from Sri Lanka and one from Nepal and New Zealand each.
The registration window for the foreign players is still open and closes on November 21, following which an updated list will be released.
Some quarters suspected that De Villiers’ absence in the PSL could be because of the fact that the entire PSL will be played in Pakistan this year.