Bale has told Ronaldo not to leave Real Madrid [GETTY]
Superstar Ronaldo hit a hat trick in Madrid's 5-0 win over Athletic Bilbao on Sunday, two of the goals made by Bale before he flew to Cardiff by private jet for Wales' European Championship qualifiers.
Ronaldo, 29, has hit an incredible 13 La Liga goals already in six games and Real Madrid manager Carlo Ancelotti is tipping him to be world player of the year again.
But Ronaldo is not happy with Real Madrid's transfer policy that has seen Xabi Alonso and Angel Di Maria sold this season and key men Arjen Robben and Mesut Ozil before that.
Manchester United, who sold Ronaldo to Madrid for £80m five years ago, are keeping track of the situation with an eye to bringing him back to Old Trafford.
But Bale said: "Should Ronaldo go to Manchester United? Definitely not.
"He's shown what a world-class player he is, year after year, scoring the goals.
"Obviously as players we wouldn't want to see Ronaldo leave. Of course we want to see him stay at Real Madrid."
Bale has won the European Cup, Super Cup and Spanish Cup since joining Real Madrid 13 months ago with 27 goals in his 56 games for them.
His £85.3m fee from Tottenham eclipsed even what Real Madrid paid for Ronaldo, but Bale is coming under pressure.
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A poll of Real Madrid's fans said Bale should be dropped to the substitute's bench, something he answered with his performance against Bilbao ahead of Wales' two qualifiers against Bosnia-Herzegovina on Friday and Cyprus on Monday.
While monitoring Ronaldo's situation, Manchester United manager Louis Van Gaal is also checking on Bale and the possibility of adding him to his galacticos.
But Bale is adamant that he will be staying with Real Madrid.
"I signed a six-year deal last year so I don't really think I'll be leaving Real," said Bale, who was voted Welsh Player of the Year this week for a record fourth time.
Bale is optimistic that he can lead Wales to the European Championship finals, the first time they will have qualified for a major competition since 1958, and said: "Qualifying for major tournament would rank with winning the Champions League for me.
"Everyone wants to win trophies, everyone wants to play in major competitions. It would be right up there and hopefully we can do it."
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David Gill, the former Manchester United chief executive, will stand for election as a FIFA vice-president when European soccer's governing body holds its congress in Vienna in March.