The winger is preparing for his third loan spell in the Championship after struggling to make an impact at Sunderland.
The Swiss international signed on loan for Nottingham Forest this week.
Bournemouth sold the winger to Newcastle United earlier this summer.
Newcastle United lost 1-0 to Fulham at Craven Cottage.
The Frenchman is set to join the Hammers this weekend.
The 24-year-old has left the Scottish Premiership side for Rotherham United.
Newcastle United were beaten by Fulham in their Championship opener on Friday.
Don Goodman doesn't think Leeds will be challenging the top eight this season.
The Gunners have been in impressive form in pre-season so far.
Many are hoping to see Rangers challenge Celtic for the title next season.
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Jose Mourinho once discarded the Spaniard, who is now a key player.
Leeds linked Liam Lindsay had claimed a Partick exit may be necessary for his career, and he is being proved right.
Stefan Johansen is proving Celtic boss Brendan Rodgers wrong with his form in the Championship with Fulham.
Celtic's new Head of Recruitment Lee Congerton endured disaster the last time he did business with the Bhoys.
O'Connor had been on trial with Leeds United.
Ben Brereton has not started in any of Nottingham Forest's last three matches.
Vincent Janssen scored during Tottenham Hotspur's last match against Millwall.
The former Newcastle United team-mates could not have predicted this turn of fortunes.