Last updated on .From the section Cricket
The first Test between England and New Zealand will be played at Lord's.
The 30-year-old took a heavy fall while chasing a ball to the boundary in the sixth over of the first day.
Parkinson will make his Test debut after being called up.
The 25-year-old will join the match later on Thursday.
Parkinson is England's first concussion substitute in Test cricket.
He was playing in the T20 Blast.
The left-armer had not been in his home since 2019.
He chased an edge off the bowling of Stuart Broad to the third man boundary.
After stopping the ball from reaching the rope, he landed awkwardly and received treatment from the medical staff of both teams.
He left the field immediately and was diagnosed with a concussion after being assessed.
The bowler fainted at home, hit his head on a sink and was struck on the head while batting by Morne Morkel, all of which resulted in concussions.
The use of concussion substitute was allowed by the International Cricket Council. Australia's Marnus Labuschagne became the first concussion substitute at Lord's after Steve Smith was struck by an England bowler.
England had to replace Leach with another frontline spinner.