Robin van Persie will find out the results of a scan on Monday on his damaged right ankle.
Manchester United’s leading scorer left the Liberty Stadium on crutches following his team’s 2-1 defeat to Swansea City and wearing a protective boot.
Van Persie could not be substituted because United had already used their three replacements by the time he was hurt and Louis van Gaal claimed his team finished the match effectively with 10 men.