[4] By the end of the season, Grant had established himself as a regular in the England youth set-up, and joined the under-21 team for a training session in Sardinia prior to the European Championship qualifying games against Serbia & Montenegro and Slovakia in June 2003.

[5] Grant finally made his debut for England under-21s on 9 September 2003 after Chris Kirkland injured himself during the pre-match warm-up prior to the European Championship qualifier against Portugal,[6] and went on to make a further three appearances for the youth side.

[8] Derby's young 'keeper Lee Camp was given a chance during the 2004–05 pre-season after a highly successful loan spell at Queens Park Rangers the previous season.

The move led to press reports that Grant was surplus to requirements at Pride Park, however manager George Burley dismissed the story as "total speculation with no basis in fact".

Grant went on to start the following match against Burnley whilst Camp served a suspension for the red card, but would not play another first team game for the remainder of the season.

[17] After playing just three games in 18 months, Grant was allowed to join Championship club Burnley on a one-month loan on 15 November 2005 as cover for the suspended Brian Jensen.

Grant was again given a chance during the 2006–07 pre-season, and Derby manager Billy Davies awarded him with a starting place for the club's second league game of the season against Stoke City on 8 August 2006.

[26] Grant signed a three-year contract with Championship club Sheffield Wednesday on 2 July 2007, joining at the same time as another young 'keeper, Robert Burch.

"[29] Grant played an integral part in maintaining Sheffield Wednesday's Championship status during the 2007–08 campaign with many excellent performances including a crucial and memorable save on the final day against Norwich City at Hillsborough.

In the second Steel City derby of the season Grant pulled off another memorable save from Billy Sharp holding onto Wednesdays' 2–1 lead and complete their first League double over the Blades for 95 years.

[36] In the following game, he made an important late save to ensure the club's first league victory of the season, in a 2–1 win at Brighton & Hove Albion.

He made a string of saves and denied Darius Henderson from the penalty spot during The Rams' match against fierce rivals Nottingham Forest on 28 September, but could not stop 10-man Derby from losing 1–0.

[43] Grant conceded four goals as Derby lost 4–1 to rivals Leicester City on 10 January, but was powerless to stop them and made several good saves to keep the score down.

"[46] On 31 August 2016, Grant joined Premier League club Stoke City on a six-month loan to provide cover for the injured Jack Butland.

[52] On 4 January 2017, after impressing during his loan spell with six clean sheets in 15 league appearances in the 2016–17 season,[53] Grant joined Stoke City on a two-and-a-half-year deal for a fee of £1.3 million.

[60] Grant signed for Premier League club Manchester United on 3 July 2018 on a two-year contract for an undisclosed fee,[61] reported to be £1.5 million.