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The Chile ace, 26, quit Barcelona for Arsenal last summer despite interest from Liverpool.

But Thompson reckons the move should never have happened.

The former Reds boss believes Kop chiefs made a big mistake by selling Luis Suarez to Barca without using Sanchez as part of the deal.

He said: "The talk was that Liverpool had made a big bid for Sanchez.

"I wouldn’t have let Suarez get in the taxi to the airport if Sanchez hadn’t have already done the deal.

“Liverpool were in the driving seat on this. They could have said to Suarez, ‘sorry, as much as you want it to go and it’s Barcelona, you are not going anywhere until he signs.’

“I know there were family issues and that’s why he went to London but I wouldn’t have let it (the Suarez transfer) happen.”