The phrase "agreed afterwards" is correct and usable in written English.
It can be used to indicate that a consensus or agreement was reached at a later time following a discussion or event.
Example: "After much deliberation, we finally reached a decision that we all agreed afterwards."
Alternatives: "consented later" or "reached an agreement subsequently".
But the 28-year-old was fine to continue and got to his 26th first-class hundred after tea, with a draw agreed soon afterwards.
If the score-line suggests it got increasingly difficult for Murray to subdue the young prospect, that is a fair assessment, as he agreed courtside afterwards.
A second loan deal for a further two months at Bradford was agreed shortly afterwards, and Wallwork scored a further two goals, taking his total with Bradford to four in seven games.
Ruth Smeeth stepped down before the vote in anticipation of disobeying the leadership's instructions, while four more frontbenchers who voted against the amendment agreed to resign afterwards.
Accused of trying to whitewash Japan's wartime history, the Education Ministry soon afterwards agreed to restore to textbooks accounts of the military's involvement in the suicides.
George Osborne was impressed with the Stevens approach and soon afterwards agreed to find £2bn extra for the NHS in England for the 2015/16 financial year.
The House afterwards agreed to the Senate amendment, and the bill authorizing a Panama canal passed.
Most of the pundits afterwards have agreed that Romney "won" the debate, but so what?
"We met afterwards and agreed that the coach had acted irresponsibly, first by taking an athletes' accreditation and even presenting his samples for testing".
Briefly chatting afterwards, we agreed that modern-day coaches should reflect constantly on the way they operate – on whether they are experts at offering guidance, or whether they are merely expert interferers.
