According to Sky Sports, Enner Valencia is undergoing a medical at West Ham ahead of a £15m move.
Patrick Van Aanholt scored as Crystal Palace moved out of the bottom three with a 1-0 win over Middlesbrough.
Middlesbrough are now winless in nine straight leagues matches after Saturday's 1-0 defeat at Crystal Palace.
Everton star forward Romelu Lukaku shook off any worries over his fitness with a goal in a 2-0 win against Sunderland.
Gareth McAuley scored a crucial goal again in Week 26 as West Brom beat Bournemouth 2-1 at the Hawthorns.
Sunderland remains bottom of the Premier League after yet another goalless outing in a 2-0 loss to Everton.
Artur Boruc couldn't effectively punch out Chris Brunt's corner and Gareth McAuley was first to react and the resulting goal cost the Cherries a point.
Cesc Fabregas and Pedro both scored and assisted each other's strikes as Chelsea continue to pace the league with a 3-1 win over Swansea City.
Swansea City were the latest victim of table-leading Chelsea, as a Fernando Llorente goal was not enough to earn a positive result in a 3-1 loss.
Hull City were held to a 1-1 draw at the KCOM Stadium by Burnley.
Burnley won't have winger Johann Berg Gudmundsson and midfielder Steven Defour available for the weekend.