Sam Allardyce believes Jussi Jaaskelainen's confidence has been rekindled since moving to West Ham United and has praised the goalkeeper's impact.
Jaaskelainen joined the Hammers in the summer to replace Robert Green and had previously spent over seven years playing under Allardyce at Bolton Wanderers.
The 37-year-old lost his place at Bolton in the second half of last season, but Allardyce feels the Finn is back to his best after an impressive display in Saturday's 0-0 draw at Norwich City.
"The big man is there to do a job and he has done the job superbly well for us," said the West Ham boss.
"I know that Jussi's strength was the coaching that Fred Barber used to give him at Bolton, which he lost.
"I knew that when he got here with Martyn Margetson, that Marge would sort him out, put him back into a right good frame of mind and rekindle all the old experience he used to have.
"Perhaps he had lost faith in himself a little bit and lost faith because he wasn't playing, but Marge has rekindled his confidence and put him in the right frame of mind."
Allardyce continued: "When you have got the experience that he has got and are in your mid-30s, today you are still a very good goalkeeper if you want to be.
"If you look at Brad Friedel, he is 41 now, so we know that being in your mid to late 30s is not a problem anymore.
"It is using that experience and having the dedication to keep your body right, which Jussi does."