Conversation so far:
What was Spell in England?
His spell at Old Trafford was not a great success.
Why wasn't it a great success?
He had trouble adapting to the faster pace of the Premiership and was not allowed the same space and time on the ball.
What else was bad about his time at Old Trafford?
There was plenty of pressure on him at the start of his second season at Old Trafford.
What else happened in his second season?
in the Champions League, where he excelled due to the slower tempo of the matches.
Did he win games in the Champions League?
at Old Trafford and his performances did improve considerably, especially in the Champions League, where he excelled due to the slower tempo of the matches.
What else was notable about his second season?
Questions over his performance led to an expletive laden tirade.
What was the outcome of the tirade?
fans and pundits alike agreed that the signing was an expensive flop.
Did he sign with someone else?
he was eventually convinced by then Chelsea manager Claudio Ranieri that his future lay at Stamford Bridge.

Question: When did he begin at Stamford Bridge?
Self-contained rewrite: When did Juan Sebastián Verón begin at Stamford Bridge?