Carlton great Robert Walls believes Jack Watts' on-field attitude could bring about the end of his career within two years should the Port Adelaide recruit fail to "make up his mind" at his new club. 

After being traded to the Power this off season following 10 years of ups and downs with the Demons, Walls outlined his doubts about the former No. 1 draft pick, saying his hardness at the ball will be scrutinised further than ever before. 

โ€œThatโ€™s the worry for me, is Jack Watts,โ€ Walls told AFL Tonight.

โ€œMelbourne were happy to get rid of him. Why? Because they just felt that under Simon Goodwin, the senior coach, that he just didnโ€™t go as hard, as strong, as committed as they would have liked. Thatโ€™s why he got dropped early last year, because they just felt that he wasnโ€™t putting in as expected.

โ€œThisโ€™ll be interesting because the expectation on Watts with Port will be really high. They wonโ€™t want to see him getting easy ball out wide. Theyโ€™ll expect him to win his own footy.

โ€œHis career could be over in two years. Iโ€™ve got a real question mark over Jack Watts and Port Adelaide.

โ€œIโ€™ve heard him say that footballโ€™s not everything to him. Well, thatโ€™s OK, but if youโ€™re earning a lot of money and thatโ€™s your No. 1 job then itโ€™s got to be for that period of time.โ€