OXFORD United manager Malcolm Shotton's patience has finally snapped.

Shotton plans to make at least two changes for the visit to promotion favourites Bolton tomorrow and intends altering the system as well in a bid to stop conceding "silly goals".

Six-goal leading scorer Dean Windass may have a pain-killing injection to enable him to play after his knee opened up in training at the start of the week.

Shotton would not reveal what changes in personnel he was plotting, but Matt Murphy, Christophe Remy, Anthony Wright, Jamie Cook and Brian Wilsterman are all challenging for places.

Murphy and Remy came off midway through the reserves' win at Swindon on Wednesday and it would be no surprise if Murphy came in to boost numbers in midfield or if fit-again Remy took over at right back or on the right of midfield.

United's boss may also be thinking of switching players at the back. Wilsterman is putting pressure on Phil Whelan and if Shotton decides on five at the back, he could use Les Robinson in a three-man central defence.

"We've got to stop conceding silly goals. They are individual errors and often things we work hard on in training," he said.

United are taking an 18-man squad north for back-to-back Division 1 games just north of Manchester. After facing Bolton at their magnificent new Reebok Stadium tomorrow, they take on Bury at Gigg Lane on Tuesday. Wright is included in the squad and seems likely to get his chance in one of the games, if only as a sub. He impressed when playing 30 minutes for Wales Under 21s in a 2-2 draw in Denmark (coming on when the score was 2-2) and Shotton said: "He's got good ability. Playing our good young kids has got to be the way forward.

"I've said to Mark Harrison and Mickey Lewis that if they think anyone deserves a chance we've got to see what they're like."

Bolton boss Colin Todd has an embarrassment of riches with the return fully fit of five players from international duty this week.

Claus Jensen, a £1.6m signing from Lyngby, returns to continue his Danish midfield partnership with Per Frandsen, who played in Denmark's 1-1 draw in Switzerland.

Strikers Arnar Gunn- laugsson and Nathan Blake, who helped Iceland beat Russia 1-0 and Wales to defeat Belarus 3-2 respectively, are the likely front pairing, leaving £3.5m Dean Holdsworth to make do with being a substitute.

Bob Taylor, a quality Division 1 striker, can't even get on the bench.

"That just shows what we're up against," Shotton said.

"Bolton are a Premier League outfit. With the £3.5m parachute payments they get after dropping out of the Premiership it's nothing for them to go and spend £1m on a player."

Shotton said: "I just hope my players have learned from Sunderland. I certainly have. This is another mental test for us and the senior players have got to help the younger ones deal with it."

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