Alonso looked tired in Chelsea's 2-1 defeat against Wolves on Wednesday night as both the hosts' goals were initiated from the right wing.
Having scored five goals in his last four appearances for Chelsea, the player is being backed to feature more over the festive period with games coming thick and fast.
Storm clouds have been gathering over Jose Mourinho's misfiring United side and on a wet night in the north west they again looked well short of being contenders for the top four.
"That's the only thing, what is best for us".
"We played very well for 55 minutes and then suddenly we were another team", bemoaned Chelsea manager Maurizio Sarri.
It was Chelsea's second Premier League defeat in three games, having previously been unbeaten, and Sarri admits he is anxious by how easily his team wilted.
"I know very well that there are discussions between the club and the manager of Eden every week, I think", said Sarri.
Willian felt he had been fouled in the build-up to Wolves" victor, but Sarri was not interested, continuing: "I think it's more important to talk about our attitude after the first goal.
Ruben Loftus-Cheek looked set to take centre-stage when he marked just his second Premier League start of the season with the opening goal in the 18th minute.
Ryan Bennett's goal-saving tackle denied Willian in the first half and Alvaro Morata missed an excellent chance immediately after the break.
They were made to pay for their profligacy when James Maddison found the bottom left corner after 74 minutes, his second goal in as many games. If you're stuck for correct score predictions, don't worry, we have them all here from our football writers.
"That is credit to the boys and the the crowd for how they were noisy and backed the team". "So it's good to change players and not see the difference and to still get important wins like [against Watford]".