Bryan Robson has singled out Jonathan Greening as West Bromwich Albion's star midfielder this season but insisted there is still a lot of room for improvement ahead of this Saturday's clash with Arsenal.

The 26-year-old has operated in both a wide left and central role for Albion this season as Robson has rotated his squad.

The Albion manager has worked his way through several permutations but seems no nearer to finding a successful formula in his midfield engine room and the Baggies entertain the FA Cup holders bidding to halt a dreadful run of form that has brought just one point from the last six fixtures.

Greening, who has been called into the England squad under Sven-Goran Eriksson in the past, has the potential to play a major part in an Albion revival, without a doubt, but Robson believes there is still one vital ingredient missing from his game.

"With Jonathan's ability he should be scoring more goals," said Robson. "He started his career as a right winger and I think he has improved his left foot as his crossing has been excellent with what people would deem his weaker foot.

"What we need to do is get Zoltan Gera back to his best and scoring goals and Jonathan to improve on his range of goalscoring; if we do that, it helps take away the pressure from our forwards.

"Nobody has been outstanding in the midfield area this season and that is an area we need to improve on.

"Jonathan Greening has been close to his best form in some of the games, but there is a lot of room for improvement from all the other boys."

One of those players under scrutiny by Robson is Inamoto. The Japan international has only appeared sporadically since Robson's arrival at The Hawthorns last season and, according to Japanese Football Association sources, has been left out of the team because of his failure to track runners.

The Albion manager admitted that was one of the reasons behind Inamoto's exclusion but added that the problem wasn't exclusively his, and a lot of his teammates were also culpable.

Nevertheless, Robson and his assistant Nigel Pearson have addressed the problem with Inamoto in a fashion that transcends any language barriers.

"He has been working on it in training and we have even put a video tape together for him on certain aspects of his game just to show him on tape as well," said Robson.

"I have spoken to Inamoto and and told him how he can improve is that as a central midfield player in the Premiership you have to track midfield runners.

"You can talk about certain things but players don't sometimes take it in but, when they see it on a video tape they all of a sudden take it on board." Robson is leaving no stone unturned in his quest to reverse Albion's fortunes and thorough preparation, such as video analysis, is becoming the norm for his squad.

And he is optimistic this comprehensive attention to detail will pay dividends on Sunday against Arsenal.

The Baggies competed well against the Gunners last term, when a Robert Earnshaw strike earned a point at Highbury before two late goals condemned them to defeat at The Hawthorns. But with Arsenal in the midst of an injury crisis it is as good a time as any to take on ArsEne Wenger's cosmopolitan mix of stars.

"As long as you prepare yourself correctly you can beat anyone on any given day and we have to approach this game against Arsenal in that way," said Robson.

"In the home game last year, we had chances before they scored on the hour mark and then the game went away from us because of our game plan.

"For the first period, we were the better side and we can take heart from that.

"Ashley Cole and Sol Campbell are suffering with injuries while most of their players will have played in midweek in internationals, so the game is there for us to go and impose ourselves on it."