Tony Pulis has confirmed West Brom have made a bid for Morgan Schneiderlin and four other players ahead of the January transfer window.
Sky sources understand the Baggies have submitted an £18m bid for the Manchester United midfield outcast, who has not featured in Jose Mourinho's team since November 19. Mourinho confirmed on Friday that the former Southampton man can leave if the price is right.
"I don't want to say any more other than confirm our bid (for Schneiderlin). We have to be fair to Manchester United and the player," Pulis said on Friday morning.
"We have made bids for about five players. Doing business with people should be done directly with them.
"We aren't going to try and do everything in one window. It might take a couple of windows to get the quality in that we want.
"All transfer windows are important. This is the most important one though because it's about to happen."
Pulis admits West Brom will have to be at their very best to secure a third away win of the season when they visit the Emirates.
"Arsenal have a wonderful squad that's capable of winning the Premier League this year. They have players to come back too," he said.
"It's always a really tough test going down to Arsenal. You have to be at your best and they have to have an off day. We need things to go our way. Sometimes they do.
"It's always lovely beating one of the top teams and it would be great if we could go to Arsenal on Boxing Day and do that."
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Pulis confirmed interest in Southampton's Jay Rodriguez has cooled with the striker now set to stay at St Mary's, the first-team door having opened for him in light of Charlie Austin's injury.
The 27-year-old, who was close to making a summer loan switch to the Hawthorns, scored twice in the Saints' 3-1 win at Bournemouth last week.
Pulis said: "We were very interested in the summer, we nearly got a deal done at the beginning of the season. We were very interested until he got those goals against Bournemouth and that's ended that one."
Pulis will assess James Morrison (flu) and Jonny Evans (calf) over next couple of days to see if they're fit for Boxing Day.
Saido Berahino will not be involved after three months out as Pulis said he still needs more fitness before "he gets to the level we want".