So after a week of transfer talk, speculation and agent intervention, Marko Arnautovic starts for West Ham. Manuel Pellegrini makes five changes from the weekend FA Cup win over Birmingham, as Lukasz Fabianski, Pablo Zabaleta, Aaron Cresswell, Mark Noble, Felipe Anderson return.
Samir Nasri starts a Premier League game for the first time since August 2016 against his former club.
Unai Emery reverts back to the Arsenal side that kicked off 2019 with victory at Fulham.
There are eight changes to the side that dispatched Blackpool in the third round of the FA Cup, with Sokratis, Ainsley Maitland-Niles and Alex Iwobi the only players to retain their places.
West Ham: Fabianski, Zabaleta, Ogbonna, Diop, Cresswell, Noble, Rice, Antonio, Nasri, Anderson, Arnautovic.
Subs: Adrian, Masuaku, Obiang, Snodgrass, Diangana, Perez, Carroll.
Arsenal: Leno, Mustafi, Koscielny, Sokratis, Maitland-Niles, Xhaka, Guendouzi, Kolasinac, Iwobi, Lacazette, Aubameyang.
Subs: Cech, Bellerin, Lichtsteiner, Monreal, Torreira, Ramsey, Nketiah