Alastair Campbell is set to join 'Good Morning Britain' as a guest presenter.

Alastair Campbell

Alastair Campbell

The 63-year-old former adviser to ex-Prime Minister Tony Blair has revealed via Twitter that he'll soon be sat alongside Susanna Reid in the 'GMB' studio.

He wrote on the micro-blogging platform: "So weird to be wearing suit and tie. Been in at @GMB checking the presenter chair and seeing if I can cope with the tech! And no I am NOT the new @piersmorgan BUT I will be presenting alongside @susannareid100 May 10-12 thru Mental Health Awareness Week. 1/2

"In addition to usual news, views and interviews hoping to draw attention to MH Issues which GMB have long championed. But also keen to get stuck in on all the big political stories post May 6 elections. No piano! Wish I’d been on this a.m!#johnlewisnightmare #Nolan #wallpaper 2/2 (sic)"

The signing is a coup for 'Good Morning Britain', which suffered a major blow when Piers Morgan quit the show in March.

A source told the Daily Mirror newspaper: "Campbell's political analysis and journalism pedigree is second to none. MPs could certainly be in for a rough ride but it will make great TV.”

Alastair is looking forward to joining the show - although he's dreading the early-morning starts.

He said: "I am flattered to be asked and delighted that my stint will coincide with Mental Health Awareness Week as 'Good Morning Britain' has always championed good mental health.

"I am also looking forward to getting stuck into the big political and social issues at such an important and difficult time for the country, as well as brushing up my knowledge on some of the subjects that will take me out of my comfort zone.

"In addition, there is an element of finishing unfinished business here ... back in the mid 90s I was a regular presenter of the paper reviews on BBC Breakfast and during the week the former Labour Leader John Smith died, I was in discussions with the programme about becoming a presenter. John’s sad death led to me working for Tony Blair and my life and career took a very different course…

"I must admit I am slightly dreading - make that totally dreading - getting out of bed in the middle of the night to get ready to present the show. But I am really looking forward to it."