Leeds United's Samu Saiz wasn't at his best on Saturday.
The Spanish attacker did not look at his creative best on Saturday as Leeds edged out Norwich City to win 1-0 at Elland Road and move five points adrift of the top six.
Pontus Jansson's 41st-minute header was enough for United on a day when a number of their high-profile attackers didn't turn up in the final third.
Saiz, a £3.1 million signing from Huesca in the summer, has arguably been the Whites' best player this season after netting five goals and grabbing five assists from 20 league games.
But Whelan has noticed recently that the 26-year-old is taking too long on the ball to the detriment of Leeds' attacks, frustrating his colleagues in the process.
"He needs to simplify his game. You don't need so many touches, you do your nice turn, release the ball, carry on the run forward or find another space to get on the ball and make something else happen," he told BBC Radio Leeds.
"The more touches he has, it allows defenders to get back behind the ball or get a tackle in on him. It seemed like he was trying that little bit too much. The Saiz we love is the one who does that quick turn, quick pass and it hurts teams.
"At the moment, especially the last two games, it seems that he wants that extra touch and that extra touch, and another touch, then that pass has gone and then people are getting a tackle in and it's breaking down. It's frustrating other players because they are making good runs."
According to Opta, Saiz had 53 touches in his 81-minute stint against the Canaries, manging 25 successful passes from an attempted 34.
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