The second choice goalkeeper is purely there to keep the first choice keeper on his toes.
One bad performance, or too many mistakes, then that could spell the end for the number one shot stopper for a fair few games. As number two goalkeepers go, former Bolton Wanderers man Jussi Jaaskelainen is up there with the very best.
This is a keeper that has made 530 appearances in the Premier League for both Bolton Wanderers and West Ham United, and the 39 year old is still going strong.
However, Jaaskalainen isn’t getting any younger, so who is available to replace the former Finland international this summer?
Here are FIVE potential understudies to keep Adrian on his toes.
Click on the man himself to reveal…