Chris Silverwood is out of the reckoning for the Fourth Ashes Test at his home ground of Headingley after the paceman was again struck down by his mystery back trouble.

Silverwood was forced to pull out of the squad for the Third Test because of the problem.

Yesterday evening he bowled four overs and took a wicket in the Roses encounter at Old Trafford but had to leave the field when the injury recurred.

Silverwood has not had the problem specifically diagnosed and is due to have a scan in the middle of next week.

Silverwood told Sky Sports: "It is the same problem unfortunately - it is a recurrence of the back problem I have been suffering with.

"We are not quite sure what it is, so I will have to go for a scan.

"It is an untimely setback for me, but there is nothing I can do about it. There is no point getting down about it."

Meanwhile Mark Ramprakash had a scare when he turned his ankle playing indoor football yesterday while the rain fell at The Oval.

However, although he did not take the field first thing this morning as Surrey's game against Glamorgan resumed, he did reappear later in the session.

© CricInfo Ltd.