Jonathan Trott needs "time, support and space" to recover from his stress-related condition, the Managing Director of England Cricket has said.
“Jonathan Trott is an incredibly talented cricketer who has proven himself time and again for England. The cricket side of things is unimportant now, all that matters is that Jonathan is given the time, support and space he needs to recover," Hugh Morris said.
"We fully support his decision to leave the tour and the ECB will provide all the assistance we can to help Jonathan and his family through this period. Jonathan has asked for privacy while he recovers and I would urge everyone to respect that.”
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Five people were killed and dozens more were injured after a car and knife attack in the capital on Wednesday afternoon.
Among those expected to attend the ceremony will be former US President Bill Clinton and ex-Northern Ireland first minister Peter Robinson.
Five people have been killed and 40 injured after a car and knife attack in London on Wednesday.