The Red Devils have a hectic schedule in the closing five weeks of the season.
United may have to play in every midweek going forward with Premier League and Europa League football to contend with.
Jose Mourinho has suggested his fifth-placed side will prioritise the European competition for the sake of domestic progress.
Thursday's quarter-final second leg at home to Anderlecht, following their 1-1 draw in Belgium this week, is set to be crucial.
Antonio Conte feels Manchester United could still join Chelsea in the Champions League next term
They want to fight to arrive in this position
However, Manchester United are within touching distance of both Manchester City and Liverpool, with Arsenal falling away behind them.
And Conte believes motivation will still be high when Chelsea visit on Sunday (4pm), no matter what Mourinho claims is more important.
“No, I think Manchester United have the possibility to arrive in the table in the first four places," Conte said.
“But I’m sure United’s players know this situation. They want to fight to arrive in this position.
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"It’s not right to be concentrated only on one target if you have the possibility with two [options] to reach the Champions League.”
United are four points off City with a game in hand heading into the weekend, while Liverpool sit six points in front having played two more matches.
Meanwhile, Chelsea can maintain their seven-point lead at the top should Tottenham beat Bournemouth tomorrow (12.30pm).