Here are the top transfer-related stories in Sunday's newspapers...
Manchester City are planning a world-record bid in excess of £100m for Barcelona forward Lionel Messi, 29, next summer. They will offer the Argentine a £500,000-per-week contract. (Sunday Mirror)
City also want Brazil international left-back Alex Sandro, 25, whose current contract at Juventus ends in June 2020, with a release cause of £25.6m. If he signs a new deal with the Italian champions it would raise his transfer fee to £40m. (Sunday Mirror)
Manchester United manager Jose Mourinho is considering a move for Bayern Munich defender David Alaba, 24, and his Austria team-mate midfielder Julian Baumgartlinger, 28.